Undertale

Temmies resemble dogs, with cat-like ears on top of their heads as well as dog ears on the sides, shoulder length black hair, and blue shirts, excluding the Temmie Shopkeeper, who has gray hair and a striped blue and yellow shirt instead.
Temmies only say Gibberish like 'Fkksjdkskheudjyejsjs'
All Temmies share an erratic manner of speech, where they often exclude letters, mix lower and upper cases, make inconsistencies, etc. There are some exceptions, however; Bob always speaks in perfect English, the Temmie Shopkeeper speaks in fluent English when the protagonist refuses to sell an item she wants, and regular Temmies in-battle speak in somewhat proper English when denied Temmie Flakes. In battle, Temmies find the protagonist to be adorable and refer to them as such despite attacking them. However, they also find muscles to be disgusting, as evident by their negative reactions to the protagonist's flexing should they choose the "Flex" option. Because of this, when Aaron, a monster who has tight muscles and an obsession for flexing, appears as a result of the "Flex" option, Temmies are so put off by them that they flee on sight shortly after. According to one Temmie in Temmie Village, and the text from checking Temmie, the protagonist is allergic to Temmies. It is implied that some Temmies are also allergic to other Temmies, which explains why the one and only Temmie on the far-right was seen with hives, which the affected Temmie quirkily names "hOIVS!"

The Temmie Shopkeeper has the same basic appearance as all other Temmies in-game, with a few exceptions: light gray instead of black hair as well as a different hairstyle, and a sky blue and yellow striped shirt instead of a solid Pacific Blue shirt. When the Temmie Shopkeeper is paid to go to college, they don a black graduation cap. The Shop itself shelves a branch with a leaf, a bone, a glowing purple potion and two single socks, both very different in size and design. On top of a couple of what seems to be cardboard boxes, a picture of the Annoying Dog can be seen. Although these items are displayed for purchase, they are unobtainable in the real game and serve no purpose rather than decoration. The shop's "counter" is also just a cardboard box with the words "TEM SHOP" on its side facing the protagonist, matching the colors and clothes of the Tem Shop owner.

The Temmie Shopkeeper, like most Temmies, speaks with incorrect capitalization and spelling. Though there are various dialogue options, they typically say "hOI" to each, only noting the topic's existence when the protagonist asks about it (for example, if the protagonist asks about the shop, the Temmie Shopkeeper only recommends that the protagonist goes there). Unlike most other Temmies, when the protagonist refuses to sell an item after they raise the price twice, they speak in perfect and fluent English.

Chara has brown medium-length hair with bangs swept to the left, cream skin, brown eyes, rosy cheeks, and a wide smile. Chara wears a long-sleeve lime green shirt with a single horizontal cream stripe, and a pair of nondescript brown pants and shoes. Chara's semblance is described as being somewhat similar to the protagonist's, with their shirt also being a color-negative of the protagonist's shirt.

Much of Chara's intent is ambiguous. While initially cast in a sympathetic light by monsterkind, Asriel admits that Chara "...wasn't really the greatest person". In the VHS tapes, Asriel's commentary indicates Chara is mischievous, as they can make a "creepy face" to scare others.[6] Chara is also intelligent, secretive, and persuasive. They do not allow their plan be recorded,[7] and gain Asriel's trust in order to move forward with it.[8] At an unspecified point, Asgore had also noticed Chara once had a sense of hope in their eyes. In terms of interests, it is implied that Chara was interested in gardening, as their knife is specified to be perfect for cutting plants and vines.[10] Throughout Genocide Route, there are implications that Chara has an interest in knives[11] and chocolate.[12] In contrast, Chara has an unexplained hatred for humanity.At the end of Genocide Route, Chara's behavior when they appear is polite and terse, yet blunt and critical.[13] Despite the end of a second Genocide Route, Chara is unable to comprehend the repeated violence, and expresses confusion that it occurred before criticizing

Asriel is a Boss Monster; like his mother, he resembles the Mimiga species from Cave Story. He has white fur, long ears, a snout, and a set of visible fangs. As a child, he lacks horns and has a small tuft of fur atop his head, unlike his parents. He wears a green long-sleeved shirt with yellow stripes and black pants, similarly to the fallen human's clothing. The number of stripes on his shirt varies: in his battle sprite before becoming the "God of Hyperdeath" it has four, in the flashback cutscene during his battle it has one, and in his overworld appearance it has two. Asriel's overworld sprite shares a color palette (white, yellow, green, and black) with Flowey's.
God Of Hyperdeath: God of Hyperdeath
In contrast to his appearance as a child, Asriel has black sclerae with white slit pupils, longer fangs, a pair of horns, and black markings on the sides of his face. He wears a long robe with white sleeves and the Delta Rune symbol, akin to Toriel's robe, as well as a large collar with shoulder pads.
Final Hyperdeath God Form: Asriel's body becomes more geometric, his horns are longer, and his claws and teeth get sharper. He has a pair of wings that continuously change color, and his lower body becomes sharp and heart-shaped. This form physically resembles the Delta Rune

Before his death, Asriel was a docile, loving, and gentle child. He was also compassionate, as he helped the injured fallen human despite The War of Humans and Monsters. In the VHS tapes, Asriel's dialogue implies he highly trusted the fallen human, as he continued their plan to break the barrier to free monsterkind in spite of his doubt and discomfort. As Flowey, he lacks a SOUL and is incapable of feeling love. This saddened him initially, as he blamed himself for his fate.[3] Eventually, he became resentful and murderous. After temporarily regaining his compassion, Asriel regrets adopting the "kill or be killed" philosophy and apologizes for his actions to the protagonist, understanding that they may not forgive him. Upon exhausting all of his dialogue during the True Pacifist Route epilogue, Asriel will say "Don't you have anything better to do?" to the Protagonist, a quote said several times by Flowey.

It is possible that Asriel inherited his father's trait of being bad at coming up with names, as he named his flower form "Flowey".

he is dead.

Asgore is a large Boss Monster, and the tallest main character in Undertale. Asgore has two large curved horns, golden-blond mane and beard, white fur, long ears, a snout, and a set of visible fangs. Asgore wears a small, three-pointed crown atop his head, golden pauldrons and a long purple cape that slightly drags along the ground, which he often uses as a cloak for his armored body. Asgore's armor consists of a large chestplate, with a winged crest of the implied "angel" from the Delta Rune emblem, and his tasset visually resembling the triangles of the emblem. Underneath is a standard outfit, consisting of pants and a shirt, though only the shirt's collar can be seen in color. Asgore's weapon in battle is a sharp red trident, adorned with a six-petaled flower at its base.

Asgore is kind and upbeat, yet often quiet. He speaks in Southern slang, such as "howdy" and "golly", similarly to his son Asriel.

Asgore's interests include gardening, humming,[4] making tea[5] such as golden flower tea,[6] going for walks,[7] sparring with Undyne, dressing up and acting as Santa Claus,[8] and puns.[9] He has a sense of humor, as he accepts being called "Fluffybuns" after Toriel accidentally nicknamed him in public.[10] However, he is bad at naming places, as evidenced by him naming the kingdom the "Kingdom of Monsters",[11] the kingdom's first capital city "Home",[12] and its latest capital city "New Home".[13] Gerson suggests that Asgore may not be too intelligent, as he states everyone knew Toriel managed governing. Despite this, monsters respect Asgore as a powerful leader. Many monsters refer to him by his name, or by nickname, and partially by his title. However, he only fights humans to give hope to monsterkind.[18] Asgore feels miserable for the deaths of the six humans, does not want to kill anybody,[19] and feels guilty for declaring war on humanity.[20] This guilt seemingly extends to Asgore destroying the MERCY option. Asgore clings to the past, wishing to see his wife and Asriel even though both of them have been gone for a long time.[21] He writes the same short positive phrase in his journal every day, presumably to not think about his guilt or his family. However, he seemingly tries to bake Toriel's Butterscotch Pie multiple times, which is one of his favorites.

Mettaton is a large gray rectangular box with a 4x5 grid of rectangular lights on his front. The grid of lights can change colors between red, yellow, green, and blue, and Mettaton uses these color changes in place of facial expressions. Underneath the main screen is a row of four/five small rectangular lights. He has four dials underneath the row. The bottom of his base has a single-legged wheel. He has two segmented robotic arms that have four-fingered white gloves. On Mettaton's back is a large flippable switch, with the word "SWITCH" and an arrow above it.

Mettaton is a confident, charismatic, and charming TV host. His shows emphasize drama, action, and violence, for which he has garnered a loyal fanbase. He enjoys performing, as he often abruptly performs various actions that do not correlate to the show he is currently producing.[6][7]

Mettaton is very egotistical, having centered his brand around himself. His hotel and the products he advertises are themed heavily around his physical appearance.[8] In the Mettaton Ending, this goes to such extremes that, when placed in a position of power, he transforms the underground into a self-serving dystopia.[9]

Despite his self-centered personality, however, he deeply cares about the seemingly positive impact his show has had on the inhabitants of the underground, and is shown to have soft spots for several characters, such as Alphys[10] and Napstablook.[11] Mettaton is also secretive, as he tries to not acknowledge the Mystery Key if it is found, and refrains from sharing his friend's secrets.

Alphys is a short, yellow lizard monster who shares a similar height with the protagonist. Her head consists of a set of sharp-pointed head crests, a pair of round glasses that does not cover her eyelashes, beady black eyes, and a pair of protruding square buck teeth that is constantly visible. Depending on the direction she is facing, it is depicted as as a set of two or four teeth. Alphys has clawed hands, wears a long-sleeved, large white lab coat with her three-toed feet being visible, and her tail jutting out. Alphys's posture is somewhat hunched over, with her arms and feet curled toward each other, reflecting her anxiousness.

Undyne is a piscine, anthropomorphic monster. She has red and blue fins on the sides of her head, blue scales, a long red ponytail and a pair of sharp, yellow, protruding teeth. She wears a red eyeshadow and has an eyepatch over her left eye. She also wears a black tank top and blue jeans, but debuts in armor varying in light and dark shades of gray. Her eyes have black vertical pupils and yellow sclera. Undyne has no nose.

Undyne is hot-blooded and passionate about everything that she does. She acts quickly on her ideas and is steadfast in her beliefs.[4] Though she wants to kill the protagonist, she also makes an attempt to be fair and offers an explanation of how green mode works. Her training with Asgore taught her the value of pacifism,[5] which is why Undyne sees the protagonist as "a wimpy loser with a big heart". Undyne loves to help others and mentors Shyren and Papyrus in various skills. She dislikes puzzles, loves japes,[6] enjoys playing the piano,[7] collecting weaponry, primarily swords,[8] and anime. The latter interest is shared with her romantic interest, Alphys. Since Alphys told Undyne that anime is human history, Undyne regards human history as exciting. Undyne has the crudest vocabulary of any character in the game, being the source of the majority of the mild expletives. She also comes close to using stronger language in one of her phone calls.[10] When Undyne was younger, she followed Gerson around much like how Monster Kid follows her. Undyne enjoys greasy food,[12] particularly the cheese fries at Grillby's.[13] She also enjoys eating limes whole.[14] She dislikes cold food and soda, having a "Hot Fridge" created by Alphys to remedy the former, though she still keeps bottles of soda, most likely for Alphys.

Papyrus appears as a tall skeleton, with a skull more vertical and geometric than his brother's skull. Being skeletal, many of his expressions incorporate a toothy grin. His eyes resemble vertical slits; his skeletal pseudo-brows form most of his expressions, as well as the corners of his mouth. He has eyeballs which show at times when he is experiencing strong emotions. Papyrus is relatively taller and slightly slimmer than his brother.

Papyrus is flamboyant and brash, which is reflected by him speaking exclusively in capital letters. He presents himself as confident and charismatic, and seems to be egotistical, referring to himself as "THE GREAT PAPYRUS". However, Papyrus is also hard-working and kind at heart. He is occasionally oblivious[8][9] but can be cunning, as seen when he uses reverse psychology to trick Undyne into befriending the protagonist.[10] He is thought of to be somewhat naive by other characters, but not exactly ”dumb.” He shows great bravery as even in the face of potentially imminent death. Papyrus believes in others just as much as he believes in himself. He has so much faith in his abilities that he waited outside of Undyne's house all night and begged her to accept him into the Royal Guard. Seeing his persistence, Undyne offered to train him, but instead gave him cooking lessons. His confidence in himself and others is so great that he interprets direct insults towards him as the protagonist trying to make themselves look bad so he can hurt them more easily, rather than the possibility that they dislike him. He cooks spaghetti from time to time, though many characters seem to think that he is not very good at it.[14][15] A potential explanation for this is the fact that Papyrus has never tried his own spaghetti, only cooking it because, as far as he can tell, "EVERYBODY ELSE LOVES IT!!!".[16] He also learned how to cook from Undyne, who is not very good at cooking, as shown when the protagonist befriends her. Papyrus loves puzzles and japes, as shown by the numerous puzzles he prepares for the protagonist as well as his collection of "complex tomes about puzzle creation". He takes offense to people attempting to skip or otherwise ignore his puzzles.[18][19] Though his advanced puzzles may demonstrate his intellect, Papyrus also enjoys children's books[20] and is somewhat childish with the decoration of his room. He collects action figures[21] and disdains anime despite not having watched it before.[22] He also believes that skeletons are warm and cuddly, while ghosts are spooky.[23] Papyrus watches Mettaton's TV shows[24] and admires him so much that he would move to Hotland,[25] a region that he hates.

Sans appears as a relatively short and paunchy skeleton, with mitten-like hands. He has white dots for pupils in his black eye sockets that disappear when he is serious or angered. When Sans uses telekinesis, his left eye flashes light blue and yellow, the colors for patience and justice, and his right pupil vanishes. No matter the mood Sans is in, he is always seen with a wide, toothy-grin on his face. His clothes consists of a blue hoodie with a gray hood, a white shirt underneath, seemingly a turtleneck as seen in his battle sprite, black shorts with white stripes on the sides, and a pair of slippers usually depicted as white or pink.

Sans is lazy and relatively laid-back. Sans's dialogue reflects his personality, as he speaks in all lowercase, not even capitalizing names[6] or sentence starters, with a few exceptions,[7] such as the initial beginning of his judgments and other more typical changes to his style of speaking for the sake of emphasis. His laziness is a combination of fatalism and apathy due to being self-aware and knowing of timeline resets. Conversely, he suggests that this knowledge could be "a poor excuse for being lazy." Sans enjoys being mischievous, primarily acting this way towards those he is on good terms with. His antics range from an assortment of illogical, juvenile, and slightly inconvenient pranks; examples include selling fried snow, using whoopee cushions, sharing an unscrewed ketchup bottle, and eye paint on a telescope. He is not above utilizing his teleportation or other magic for practical jokes either.[1] Sans is also fond of making the occasional low-brow puns. He enjoys making others laugh in general, as he also performs at the MTT Resort as a comedian. Despite Sans being apathetic towards his own life, he is considerate to those he cares for. For example, Sans is a regular at Grillby's, and the monsters and Royal Guard dogs treat him kindly. Sans has informed Big Mouth about "all kinds of incredible foods", yet Big Mouth comments that "he always orders the worst burger off the menu". Although Sans dislikes making promises, he respects Toriel's request to watch out for any humans. Sans is also observant; he can often tell that the protagonist has already done certain tasks, such as SAVING and reloading, by reading their expressions. Though Sans is usually agreeable, he can become serious to emphasize a subject.

Toriel is a Boss Monster, bearing a strong resemblance to the Mimiga species from Cave Story.[2] She has a pair of visible fangs and long eyelashes, alongside floppy ears on the sides of her head, two tiny horns on top, and irises with a dark red tint. Her body is anthropomorphic, with paws at the end of her limbs. She wears a long purple robe with white sleeves and the Delta Rune on the chest. On occasion, Toriel can be seen with reading glasses.

Toriel is kind and acts as a protective mother figure for the protagonist. She is sincere in expressing her love through words and actions, as evidenced by her former marriage to Asgore.[3] She was also excited to become a mother.Toriel's hobbies include baking, reading, writing puns, bug-hunting,[5] and tending to flowers. She enjoys baking Butterscotch Pie, as well as her favorite, Snail Pie. She has many books at her house, as well as a journal full of puns.[6] She enjoyed puns even before meeting Sans. Toriel is said to be intelligent[8] and implied to be meticulous in her goals.[9] She can come off as intimidating when she is serious.[1] Her manner of speech is rather formal, often excluding the use of contractions (e.g. using "is it not" instead of "isn't it"). Toriel aspires to be a teacher. She offers instructions on puzzles[10] and prepares a curriculum for the protagonist.[11] In the True Pacifist ending credits, she is seen standing outside of a school and, in the Family Ending of the Neutral Route, she starts her own. Despite Toriel's motherly nature, she is not above swearing. Toby Fox stated in a deleted tweet that it is possible for Toriel to have said the "F-word".[13] According to Papyrus in UNDERTALE Alarm Clock, Toriel started acting weird due to drinking too much eggnog once; this included singing holiday songs and replacing all of the lyrics with swears.

Flowey is a sapient golden flower. He has a white head, six yellow petals, and a light-green stem. Flowey can emulate a variety of faces and voices: he mimics Toriel and Asgore in certain situations, the protagonist's face before the Neutral Route's final battle, and his old self at the end of the Genocide Route. Flowey's overworld sprite shares a color palette (white, yellow, green, and black) with Asriel's.

Flowey can feign a cheerful, friendly personality. He speaks similarly to his father, often using words such as "Howdy!" and "golly". When Flowey is not trying to fool the protagonist into trusting him, he is quick to insult them. In the Japanese translation, he uses "boku" for himself and refers to others with "kimi", as does Asriel. As a SOULless being, Flowey is neither human nor monster. Because he has no SOUL, he is unable to feel compassion or love, and seeks amusement by indulging his curiosity that stems from his ability to "reshape the world" with his powers of determination. Flowey is malevolent and cruel. He repeatedly berates the protagonist for not following his "kill or be killed" philosophy, yet also criticizes them at the end of the Ruins if they killed any monsters.[5] He is manipulative, devious, cunning and subtle if the circumstances require it.[6] When faced with a situation he has no control over, Flowey may act in frustration or cowardice.

Frisk is a human child who wears a long-sleeve light blue shirt with two magenta stripes, light blue pants (often depicted as shorts in the official Undertale merch), and red-brown shoes (usually depicted as black or in a darker tone). When hugging Asriel, other magenta stripes appear on Frisk's shirt sleeves. They have medium-length straight red-brown hair, short and choppy bangs, and a blank facial expression

Frisk's personality is usually ambiguous, and they're very often speechless. However, the narration that describes Frisk's actions occasionally changes depending on their LOVE. Frisk speaks to NPCs throughout the game, especially when ACTing in encounters, but the exact dialogue is implied only through choice prompts. NPCs' dialogue boxes display "..." to show that the NPC is listening to Frisk,[7] and some NPCs respond to questions that Frisk asks.