Ralsei

Angel is an important figure in Deltarune. While it has yet to appear, it is a central figure in the prophecy. The heroes are destined to banish it in order to save both Light and Dark Worlds, making it the overarching antagonist in a way.

The Angel is described as having a desire that it will finally meet with once banished. The "Angel's heaven" may be referring to this.

Several Hometown residents mention the Angel, and it appars to be a central figure in their religion. However, despite, the prophecy describing it as somewhat of a malevolent being, the Hometown residents appear to see the Angel in a similar same way as its namesake. They appear to worship it as a godlike being, believing that it is always watching over them.[1][2] In particular, Father Alvin, the church pastor, believes the Angel can be a source of guidance for the residents, often praying for it to help others.[3]

Its true appearance has yet to be seen, by the player at least. In Chapter 4, one of the tapestries in the Dark Sanctuaries depicts the Angel, though it is obscured from the player's point of view.

Darkners are typically based on an inanimate object in the corresponding Light World location. The Card Kingdom is located in the Light World's Unused Classroom, so its Darkners are based on playing cards, board pieces, toys, etc. found in that room. The Cyber World is located in the Light World's Library Computer Lab, so its Darkners are based on electronics, software components, computer programs, etc.

Darkners are capable of using magic, with their attacks corresponding to their Light World counterpart object. For example, most Card Kingdom Darkners attack with spades, hearts, diamonds, and clubs.

Darkners can be transferred to other Dark Worlds if Kris transports their Light World counterpart. Ralsei is the only Darkner known to traverse between Dark Worlds seemingly without assistance. Though any Darkner can be transferred to any Dark World, they may not be compatible with it.[1] If a Darkner stays in a Dark World they are not compatible with, they eventually turn to stone.[2] The only Dark World that all Darkners can reside in without turning to stone is Castle Town, because its fountain is made from "pure darkness."[3].

Some Darkners also have knowledge that does not pertain to Dark World. They can also recall their Hometown counterpart's interactions with Lightners.[4] Additionally, Darkners can offer advice on game controls,[5] gameplay,[6] and SAVING.[7] However, their knowledge can be limited. An example of this is Jigsaw Joe being unfamiliar with the Warp Door he can aid in repairing.[8]

Darkners seem to possess the ability to instantly tell Lightners apart from other Darkners. There seem to be some exceptions to this as Gerson Boom is initially unaware of what Lightners were. It’s possible this may have to do with him originally being a Lightner himself.

Legend of Delta Rune, also known as the prophecy, is a legend known among the Darkners in Deltarune.

When Kris and Susie arrive in Castle Town for the first time, they meet prince of the world, Ralsei, who offers to tell them the Legend. Ralsei claims that the legend was foretold by time and space. If Kris and Susie decline to listen to the legend, Lancer instead summarizes it when he intrudes.

After clearing a chapter, it serves as the game's introduction when opening that chapter from the game's main menu. A sligtly different and shortened version plays at the ending and subsequent openings from Chapter 4 onwards.

Recruiting only works on standard enemies, not bosses. If the party ever defeats an enemy violently, that enemy becomes LOST (even if they had already been recruited), and it becomes impossible to recruit that type of enemy ever again; however, defeating enemies violently increases the party members' maximum HP. Battles in the Party Dojo do not affect recruitment, so enemies can be defeated violently without becoming LOST. This is due to the Dojo fights being non-lethal sparring and training matches.

At the start of Chapter 2, all Chapter 1 enemies are automatically made recruits regardless of whether they were spared or defeated violently in Chapter 1. This is due to the lack of the Recruits feature in Chapter 1 meaning that the appropriate information was not tracked in the SAVE file at that time. Starting in the 1.07 patch, if the party did defeat enemies violently in Chapter 1, Lancer mentions that he used his authority to pardon the party's crimes

The Fountain of Darkness, also referred to by Ralsei as the "Grand Fountain," towers above Castle Town. It is visible at or near Ralsei's Castle. In Ralsei's prophecy, he states that the Fountain of Darkness "gives this land form." It can also transform Castle Town if Kris recruits Darkners.[6] With the exception of Ralsei, Darkners who leave the Dark World that they originate from quickly grow weak, before turning into stone statues. The only exception to this effect is the Dark World shaped by the Fountain of Darkness. As Ralsei puts it, the Fountain of Darkness is "made of pure darkness," allowing all Darkners to persist.

Dark Fountains are an important plot mechanic in Deltarune. They are power sources that give birth to Dark Worlds.

Potentially any Lightner can open a Fountain,[1] by projecting their will into a sharp object and piercing the ground with it.[2] However, if too many Fountains are open at once, an apocalyptic event called the Roaring takes place, in which the Titans emerge from the Fountains to devastate both Light and Dark Worlds.

When a Dark Fountain is opened, a bright beam of light emerges from where it was formed, which quickly dissipates. Then, opaque black fog seems to fill the room the fountain was opened in. If it is directly adjacent to a small area in the Light World, it will spread to the area, and if a door leading to the Light World is opened, the fog can be seen bursting from the door, rising into the sky.

In Chapter 1 Ralsei states that only the main Fountain of Darkness in Castle Town is supposed to be standing. However Asgore's documents indicate the Knight had opened years prior, King and Queen also state that the Knight has recently been opening new Fountains.[3][4] As a result, "the balance of LIGHT and DARK begins to shift."

As such, it is stated by the Prophecy that three "HEROES" are destined to seal the Fountains to restore balance. Sealing a Fountain results in reverting a Dark World to its Light World form alongside all its resident Darkners. Apparently, Kris is the only one capable of sealing Dark Fountains,[5] doing so using their SOUL.

The Knight, Kris, and Susie are currently the only Lightners known to have opened any Dark Fountains. Berdly comes close to doing so near the end of Chapter 2, but is swayed against it by Ralsei's warnings.

In Chapter 4, it is revealed that not only it is possible to open a Fountain inside a Dark World, as the Knight does in the 3rd Sanctuary, but that doing so awakens a Titan.

Kris's room contains a bed with a striped blanket, a wall shelf with trophies, a drawer with a stand for their Manual, and a wardrobe full of clothes. If the Manual was thrown away in Chapter 1, the drawer is replaced with a trash can. If Kris has eaten the moss in Chapter 1, there is "decorative moss" at the bottom right corner of the room. If collected from Noelle's room in the Queen's Mansion, the ICE-E statue appears here. Susie's room contains a spiked bed, a refrigerator, another stand for her Manual, and another wardrobe. If given to Susie during the party's reunion in Cyber City, Noelle's gift - a Susie plush - appears next to the refrigerator. If collected from Noelle's room in the Mansion, a statue of a monster similar to the Prophecy panel appears here. Lancer's room looks exactly the same as in Card Castle, but without his bike in the bed. A splat sound plays upon entering the room, and the same sound plays in reverse upon exit.

Basement Floor
The basement, or "Living Quarters for Bad Guys," contains two cages with three former kings and circus animals, and one large jail cell containing the King, whose cage resembles that of a giant hamster cage. C. Round is shown to be the protector of this room.

Ralsei's Castle
Entrance
Ralsei's castle entrance is the place where Kris and Susie meet Ralsei for the first time, before the first Lancer battle takes place. No other parts of the castle are accessible in this chapter. In Chapter 2, on the place where Kris and Susie met Ralsei the Royal Coat Rack and the Little Ball are now present, if the party hasn't hurt anybody during Chapter 1.

After returning from the Cyber World, Trashy can be found here. If all Darkners were recruited in the Cyber World, Nubert can also be seen here, with his blond wig now belonging to the Little Ball.

First Floor
After entering the castle, a large cauldron in which Ralsei cooks can be seen. To the left is the staircase to the second floor, to the right is the staircase to the basement, and a large, locked door can be found just north of the cauldron.

Second Floor
The second floor, also known as "Living Quarters," is where Kris's, Susie's, and Lancer's rooms are located, as well as a closed down staircase to the third floor, where Ralsei's room is found, but still under construction during the events of Chapter 2. After returning from the Cyber World, the Queen can be found here too, planning her new room on the third floor. If all Darkners were recruited in the Cyber World, Lancer and the Queen can be found lying on loungers here, with a Rudinn as their fan, similarly to how Susie and Lancer did in the Forest. In Chapter 4, a TV room appears right next to Queen's room with Elnino, Lanina, and Rouxls (acting as a lamppost) inside. Depending on whether or not Kris chooses to give the TV away to the person in a house in Hometown as well as whether or not all monsters in Chapter 3 have been recruited, Tenna will appear alongside them, thanking Kris for being a great host while they find a permanent home for Tenna.

A Hathy is east of Top Bakery. She expresses liking the town. If Kris has inspected all four Hathy beds in Card Castle's Floor 3F, she has alternate dialogue.[2] After Cyber World, she is happy to see newcomers. East of the Café is a clean Rabbick, excited at the notion of a "clean start." After Cyber World, Rabbick sweeps with a smaller broom.

After returning from Cyber World, some of Darkners from there are present in Town Square. Southwest of the Party Dojo, Virovirokun and Rudinn reminisces about their encounters with the party, and comments on Noelle. West of Seam's Shop is a Werewire in a suit who is thankful, though intends to keep their appearance. Nearby Top Bakery, a Plugboy is also thankful, though dislikes the restaurant. A thankful Swatchling sweeps near the Café.

In Chapter 1, Kris and Susie notice that the center of Castle Town has four vacant buildings. Each building's exterior is black, has two windows, a door, and the roof curling towards the town's road. If Kris inspects any of the buildings, all four appear to be shops that are locked, with no one present. The signage from bottom left, top left, bottom right, and top right for each shop depicts a different icon: a sack, a sword, a question mark, and an inn. After the buildings is a SAVE Point, and the entrance to Ralsei's Castle.

At the start of Chapter 2, the Town Square is the same until Kris returns with the Card Kingdom Darkners. The area itself expands to accommodate the residents. The buildings also transform from its uniform appearances into ones with distinct features. The sack icon shop becomes Party Dojo, the sword shop becomes Seam's Shop, the question mark shop becomes Top Bakery, and the inn becomes the Café. Near the SAVE point is an open manual that explains Recruits, Controls, and Item storage.

Initially, an assortment of Card Kingdom's denizens are scattered around the square. In front of Top Bakery, Rouxls Kaard wonders if Kris has also brought King. If spoken to again, he contemplates looking for a "New Employere" after Lancer announces that Rouxls will do all the cooking and cleaning.

In front of Party Dojo, a Rudinn welcomes them to "[PLAYER]Town," and expresses happiness. After Cyber World, Rudinn comments on the town's growth. If spoken to again, Rudinn has different dialogue.[1]

Southwest of the Party Dojo is a Rudinn Ranger and another Rudinn. The Rudinn Ranger proclaims the day as "National Ham Sandwich Day of Independence!" The Rudinn ponders if the Rudinn Ranger is enjoying life due to being at a "higher level." West of Seam's Shop is a Blue B Block who barks and states their appearance.

FluffyGuard
Requires 16% TP, exclusive during Spamton NEO fight. A spell that summons two orbiting shields (called "fluff balls" (was "tiny Ralsei" before, but replaced with "fluff balls")) spinning around the SOUL, blocking almost any projectiles that comes into contact, but taking damage in the process (becoming more and more red, until they disappear); up to a max of 4 shields can be active at the same time. Holding down the "[CANCEL]" button will make the shields stop moving, effectively sacrificing the SOUL's movement speed for more consistent protection.

LightUp
Requires 1% TP, exclusive to the Jackenstein fight. A spell that makes the "light area" bigger in battle with Jackenstein.

ReviveKris
Requires 16% TP to cast, is exclusive to the Titan Spawn, and Titan fights. When cast, a mini Ralsei will fly up to Kris and fully heal them.

Dual Heal
Requires 50% TP, and can only be used through Kris's ACT command during the battles against final bosses (with the exception of Tenna), and using this move in the Chapter 4 Titan boss fight uses up Susie's act command as well. Depending on his Magic stat, Ralsei heals an amount of all party members' HP. In Chapter 1, this Spell heals Magic×4 HP for each party member, and in Chapter 2, it heals Magic×5.5 (rounded up) HP for each party member.

Unnamed Fire Spell
In Chapter 5, at the end of a platforming section in Flowery's Castle, Ralsei uses this fire spell to destroy a shuriken flying towards Susie, which is animated very similarly to Noelle's IceShock. It is unknown how much TP or damage it'll deal if ever used in a future chapter.

Ralsei tells flowery that he could burn him down, already alluding of his fire magic, it is likely that the reason for not using it was that it was shown in the prophecy, of which Ralsei wishes to change.

Pacify
Requires 16% TP. If the enemy is tired or sleepy, Ralsei can cast this spell to instantly SPARE them. "SPARE a tired enemy by putting them to sleep"

Like the rest of his animations when casting a spell, Ralsei holds his hands together looking down with a yellow aura around him, then looking up holding a yellow sparkle in his hand.

Heal Prayer
Requires 32% TP. Depending on his Magic stat, he heals a small amount of the selected party member's health. "Heavenly light restores a little HP to one party member. Depends on Magic."

It can also be used outside of battle by selecting it in the stats menu, but only due to glitches, as TP does not last outside of battle. The most accessible example of this behavior is immediately after the solo battle between Susie and Lancer. The game's TP value is not reset, allowing the spell's use in the overworld up to three times with high enough TP. It heals 100 HP when used in the overworld, and 5 HP per Magic point when used in battle.

R-Action
Unlike other spells, this one doesn't require any TP. It is a variant of Susie's S-Action where Ralsei does Kris's selected act, much like paired ACTs, except that Ralsei can choose to do it with another enemy. In some boss fights, R-Action is replaced with an available act such as "Bump" during the first fight against Berdly, "Loosen"/"Toast" during the Queen fight, or "Snap" during the fight against Spamton NEO. Susie forces Ralsei to learn this spell during the fight against Sweet Cap'n Cakes.

Ralsei bows and stars and hearts come forward like Kris.

Revive song
Only available after Chapter 4, costing 84tp, Revives an downed (or probably swooned) ally, and/or heals a lot of HP, this Spell likely means there will be a rematch against the Roaring knight as its swoon effect would be able to be countered by this spell.

When using the Heal Prayer spell, green sparkles emerge on whoever is being healed.
Ralsei can float a short ways off the ground, seen in Chapter 3 when approaching the Knight, in Chapter 4 when running from the Titan. and Chapter 5 when using the Petal Feather.

Although gentle and shy, Ralsei is equally courageous, as he seldom retreats in the face of danger and displays no fear in life-threatening situations

Ralsei differs from other Darkners in that he is able to survive in any Dark World without turning to stone.

When using the Heal Prayer spell, green sparkles emerge on whoever is being healed.

Ralsei can hear background music, which is hinted at by pieces of dialogue that get used when playing songs on the large Organ.
Ralsei sometimes faces to the camera while speaking about Kris, indicating he may know about the player.
This theory is further supported by the fact that Ralsei looks towards the camera with a scared expression

It is suggested that Ralsei is increasingly annoyed whenever he is forced into wearing clothes and hats to cover his appearance, as he can be seen visibly irritated at being put in tuxedo by Flowery. He directly confronts Orange around her insulting his hatless appearance and argues with her over him being cute without it.

Ralsei enjoys baking cakes, especially for his friends. This caring side sometimes shows up when he encourages Susie and Kris to do their homework, emphasizing the importance of education, indicating his responsible nature. Despite his occasionally bossy behavior, he is himself prone to being the one bossed around, especially by Susie. He becomes flustered when receiving gifts or affection, likely due to his past isolation and lack of familiarity with others.

Ralsei exhibits a similarly antagonistic relationship with Orange, with the difference being he tends to be the one to instigate, for example, taunting orange by calling the first bullet pattern they use "easy". When Orange's true face is revealed, they continue to mock them, mock praising them for their attack that did zero damage, and repeatedly calling them a mouse, in addition to attempting to give them cheese if the GetAlong ACT is used while fighting both them and Green, even going to the extent of dressing up like a mouse.

By the time Flower Kingdom's fountain is sealed, the Roaring Knight indeed arrives to kidnap Asgore, and bisects Flowery to Ralsei's horror. Despite knowing it won't save him, Ralsei makes repeated attempts to save what's left of Flowery's life, and reassures him he wasn't useless in his attempts to keep Asgore happy. Ultimately, despite their conflicting world views and Ralsei admitting Flowery's defiance was showboaty and idiotic, he ultimately respected him and stayed by his remains until the second fountain was sealed.

Ralsei has an antagonistic relationship with Flowery, taking a noticeable and immediate disliking toward him that even catches Susie off guard. Ralsei can often be seen glaring at Flowery in contempt, and is quick to chastise him in most of their conversations. This is presumed to be due to Flowery at first forcing Ralsei into a closet and hiding his appearance with a hat as so Asgore would not see him. However, it is indicated in many of their conversations the two are familiar with one another and have a degree of shared knowledge such as Stats and Voice clips. Part of Ralsei's dislike of Flowery is rooted in a degree of jealousy, as he shows frustration of Floradinn's taking a liking to him, and the fact Flowery was able to solve puzzles faster than him. Another factor of Ralsei's dislike for Flowery is his attempts at pretending to be a human, finding it delusional. Although, most of Ralsei's anger is directed at Flowery's apparent lackadaisical attitude toward the danger of dark fountains and the Knight, going so far as to directly tell Flowery he will be killed by the latter if the fountain isn't sealed in time.

When talking in private, Ralsei reiterates that he finds Flowery arrogant in his refusal to take fate seriously counterproductive, claiming that if he ever emulated his behavior, he could burn Flowery in an instant. Ralsei has admitted to Flowery he has refrained from direct conflict as it would lead to worse outcomes, though it is implied by Flowery himself it is mostly due to curiosity of if his fate defying world view holds merit. During the climax to Flower Kingdom's fountain, Ralsei attempts to attack Flowery and explodes at him anger for continuing to drag out this fantasy, outraged when Flowery suggests Ralsei wishes to continue dutifully following the rules of the prophecy, and is only jealous of others that refuse to follow it.

During Chapter 5, Ralsei aids in helping Susie get ready for the festival and talks to her about how he'll try to be true to his promise, and becomes more honest with her regarding concepts such as the games menu system and the fact that none of the Flowers can be taken to Castle Town. In private, Ralsei prays to unknown higher powers to have mercy on Susie, showcasing how concerned he is for her fate. By the end of Chapter 5, he helps in setting up Noelle's welcome party and leaves a slice of cake by her bed to eat.

Ralsei wants to be friends with Susie for the same reason he wants to befriend Kris. However, Susie doesn't appreciate the way Ralsei tries to coach her, as he constantly teaches her to be nice to others. Susie eventually abandons the party, and forms a rivalry with Ralsei. However, this rivalry is more childish than hateful; Susie tends to mock him, calling him "toothpaste boy" during her time with Lancer. Ralsei, on the other hand, seems to regret having offended Susie and still cares about her. After Susie joins the party again, she eventually decides to stop making fun of Ralsei after he promises to bake cakes for her.By Chapter 2, Ralsei is delighted to see Susie and Kris again, and later heals Susie after she falls off the trash pile in Cyber City. Later, Susie personally takes Ralsei deeper into Cyber City and splitting up from Kris, proceeding to hang out as a duo and enjoy festivities. During this point, Ralsei teaches Susie healing spells, with Susie in turn teaching him sarcasm, improving their relationship.It grows increasingly evident how much Susie cares about Ralsei in Chapter 3, when she lashes out at him after learning he’s not real, saying she’ll never forget him, and he’s real to her.By Chapter 4, Susie encourages Ralsei to have his own possessions and enjoy eating some of his own cake. Upon discovering his empty room, Susie vows to fill it full of possessions, making Ralsei's heart ache from her kindness. However, Ralsei is initially unable to be fully truthful toward Susie, as he is aware of a tragedy that will involve her in some way, which leads to a heated confrontation in the Second Sanctuary. It is when Ralsei discloses he hid this knowledge in an effort to avoid distressing her and Kris where he is shortly after consoled that no matter what happens, they'll still be a team.

By chapter 4, Ralsei begins confiding in Kris more about the state of his existence, questioning them on if a Darkner such as himself should be developing feelings and wants as his own. As Kris confirms that he should, Ralsei is left deeply moved.

In Chapter 5, Ralsei is aware that Kris has been secretly creating dark fountains, and initially refrains from confronting them about it. While at the Flower Castle's hot springs, Ralsei reminds Kris the danger of creating these fountains and the consequences they bring, but assures Kris that he will continue placing his trust in them. However, he will urge Kris to not hold back in tense situations such as against the Titan and Flowery. During the Weird Route, it is indicated by Susie that Ralsei was heavily depressed for Kris sake, and seemed to know they would likely not be coming back from the Festival. In the event the Route is "aborted" Ralsei express open relief they're safe and sound.

Ralsei deeply cares about Kris. He wants to befriend them in order to create the trio of heroes mentioned in the prophecy, which he wishes to fulfill. Ralsei is very respectful and friendly to Kris, even to the point of offering to fan Kris with a leaf like a servant, or pretending that he is okay with being hit. Even if Kris acts rudely towards Ralsei, he won't be offended by them, and may even blame himself. Ralsei also appears to be easily embarrassed or intimidated by Kris, as it's easy for Kris to make him blush, as seen when Kris stands close to him. They are a duo for the half of Chapter 1, before Susie changes her ways and joins them again. They have more moments with each other during Chapter 2 in the acid tunnel of love, where Ralsei confides in Kris at how delightful spending time with them and Susie has been, if the the player makes Kris hug Ralsei, he grows flustered. They spend more time as a team of two when Susie temporarily splits up from them. Ralsei occasionally makes flirtatious adjacent comments toward Kris, and at one point asks if Kris was going to propose to him in Chapter 2 upon seeing the Snow Ring. As well as during Chapter 5 where he jokingly asks Kris and Susie if they want to be "chu chu choosed" (while on a mock train with "chu" meaning kiss in Japanese). Although, on at least one occasion, Ralsei has claimed to Kris that he and Susie do not take their flirting seriously.

In Chapter 3, Ralsei is further flustered if Kris says his face looks cute, internally expressing pride at this revelation of his friends. However, he expresses regret and guilt at not being able to be there for Kris in the Light World, and even asks Kris if they could buy something from the festival for Susie and pretend it's from him, showing how much he trusts Kris.

Prior to first meeting Kris and Susie, Ralsei lived alone in Castle Town without any subjects, despite his title of a prince. It is unclear if other inhabitants ever existed at some point. It is revealed that Ralsei has existed since the conception of the Prophecy,[4] and as such Ralsei know's about the full extent of it and its forbidden path, also knowing of and awaiting the Lightners Kris and Susie before finally formally them. It is currently unknown what Ralsei's Lightner counterpart is if any.

Ralsei is a very knowledgeable figure as he implicitly (and later directly) indicates that he is aware of the Player's existence, at one point looking directly at them and questioning if they can control Susie as well. Ralsei is also aware of events that transpire outside of his peripheral view, as he knew Susie was riding the Ferris Wheel with Noelle while the player was with them.[2] He will often attempt to direct the player to turn their attention elsewhere to have private conversations with Kris. While Ralsei seems to want the player to have mercy on darkners, he will at multiple points indirectly advise them to not go down the Weird Route, referring to options associated with it as "bad choices" and directly warning them and Kris by extension of it carrying a worse fate for them all. Ralsei is also aware Kris is in part actively creating Dark World's despite the risks of if it causing the Roaring, but remains patient in his faith of Kris to commit to being a prophesized hero. Despite having this knowledge, Ralsei will at certain points blend the player choices and opinions with Kris's, and occasionally react in confusion at Kris verbalizing displeasure with said choices. Ralsei has also displayed awareness of the SAVE points and mechanics,[3]as well as the configuration menu and voice clips. Despite his vast knowledge on prophesied events and mechanics, there exist things that even Ralsei is unaware of, as he was openly disturbed by the revelation the Knight had been creating fountains many years before the present day outside of the heroes involvement.

During the course of Chapter 5, Ralsei begins to drop his passivity and expresses open anger and annoyance toward various figures, primarily Flowery and Orange. Despite just meeting, Ralsei and Flowery talk with familiarity, at multiple points he suggests Flowery possess equal or similar knowledge as himself, prompting him to chastise his decisions. When it comes to the 5 other flowers, Ralsei is quicker to get along with Yellow, agreeing with Susie and saying that they are not enemies, and humorously goes through great lengths in stopping Yellow from ending his own life. It is shown that part of Ralsei's irate state is due to stress of the prophecy's tragedy drawing closer to the point of praying to a higher force to have mercy on them and Susie. It is because of this that Flowery suggests Ralsei's anger toward him is due to his open refusal to submit to the rules of their world, to which Ralsei does not fully deny.

Ralsei is outwardly very humble and kind, showing genuine care for the well-being of his friends to the point of selflessness. At the beginning of Chapter 1, Ralsei tries his best to befriend Kris and Susie in order to fulfill The Prophecy with them. Trying to be on good terms, he shows reluctance at getting angry and appears disappointed when Kris or Susie act mean. Nevertheless, Ralsei remains convinced that they have good in them and that fighting is not necessary in this world. His naivety almost costs him his life when he accepts King's fake-out surrender and heals him, allowing him to betray and defeat them. Ralsei learns from this to not always be so trustful of others. In Chapter 2, Ralsei expresses a more serious side when Queen attempts to make another dark fountain: he explains The Roaring and the consequences it will bring to the world. In Chapter 3, Ralsei reveals that he has significant self doubt and somberness regarding his status as a darkner believing he does not exist in a tangible way. In Chapter 4, Ralsei express newfound conflicting feelings of wanting things outside his role acts weird by trying to go ahead, and while he claims to not know when to say things, he is shown to be anxious near the titan and darkness spawn, and after the titan's defeat, he is very distressed when he finds out Susie went ahead, attempting to stop her from seeing the final prophecy.

Ralsei is depicted as a short Darkner. He initially wears a hooded, dark blue cloak which obscures his face, resembling the River Person from Undertale. During Chapter 1, Ralsei's pointed green hat covers his horns, concealing his entire face in shadow. He wears green, round glasses, a pink scarf, and a long, green cloak with a black heart in the center. At the end of Chapter 1 and into Chapter 2, he is revealed to be strikingly similar to a younger Boss Monster, though he has pink horns. He also has new black sleeves, & no longer wears his hat. Sometime in Chapter 2, he becomes a butler for a little while, adorning a black tuxedo, a pink bowtie and a white dress shirt underneath. He has his glasses off at one point in the same chapter, revealing that he has pink irises and eyeshadow with relatively long eyelashes. in Chapter 3, during the first physical challenge after the first board, he has a white apron with a pink bowtie (potentially his scarf), and a chef's hat with his black sleeves. During the rhythm game segment, he is dressed in a pair of black slacks, a black vest, and a silver necklace, along with a silver chain hanging off of his right pocket. Some fanart depicts him with a crop-top underneath his vest due to the chain, but in-game, he doesn't actually wear anything underneath. He’s noted by both Susie (initially), Noelle, and Asgore to looking very similar to Asriel, but also distinct and different as well. Asgore has also claimed that Ralsei does not resemble a typical boss monster.