Mukuro Ikusaba

At the beginning of the Killing School Life in Danganronpa: Trigger Happy Havoc, Mukuro appears to be a high school-aged teenager, though, like the rest of her classmates, she is two years older than they believed.

Mukuro stands at a height of 169 cm, the same height as her sister, Junko. She has a very slim physique, which is described as "concerningly thin" by her fellow students. Her physique was also described as "athletic" by observations made by some fellow peers, although said athleticism is not visually depicted in her artwork or sprites. Her complexion features fair skin with freckles adorning the bridge of her nose, and her distinctive purple-grey eyes are captivating. Mukuro's short black hair is fashioned into a stylish bob.

Being fraternal twins, Mukuro and her younger sister Junko Enoshima resemble each other closely, but have noticeable differences such as Mukuro's bust size being smaller and her eye color being purple-grey as opposed to Junko's natural red eye color.

One notable feature on her otherwise unblemished body is a striking black wolf tattoo, located on the top of her right hand, a lasting emblem from her time with the Fenrir Mercenary Group.

She typically wears a basic Hope's Peak Academy uniform consisting of a brown tie, white button-down blouse, brown pleated skirt, black stockings, and black shoes. Other minor alternations include light brown or black gloves, a brown jacket, multiple colored ties (having a red, blue, or brown one, depending on the art), and/or a military vest.

In the Despair Arc when she first meets Junko, she temporarily wears a light sweater underneath a dark gray trenchcoat-like jacket, a dark magenta pencil-skirt, brown stockings and black boots.

Under her Junko disguise, Mukuro mimics her sister's fashion choices, including her hairstyle with a presumable strawberry-blonde wig tied in large pigtails, blue eye contacts, fake red nails, and hiding her tattoo with what seems to be foundation/make-up. Her outfit, and overall appearance, is similar Junko’s Despair Arc attire, possibly being the reference for Mukuro’s disguise besides just Junko herself. Her disguise has a few notable differences in comparison, such as her dotted tie and black bra with a white outline. In Mukuro’s illustration art while disguised, her bunny hair-clip has red eyes, which is similar to Junko’s alternative Hope’s Peak Academy attire.

Mukuro has a cold, serious expression and a reserved personality. She is completely indifferent towards other people unless it's her sister Junko. Unlike her sister, she doesn't take any sadistic pleasure in hurting or killing people, but at the same time, she shows little concern for other people's suffering, regarding them more as tools such as when she was surprised Junko made all of the brainwashed Reserve Course students commit suicide despite how useful they could have been. She is mentioned in Danganronpa: Trigger Happy Havoc IF to have never held much interest in the world outside of Junko before her time at Hope's Peak Academy, and is perhaps the only Ultimate Despair member who is not obsessed with either hope or despair.

Contrasting when in her Junko disguise, she maintains a more upbeat "valley-girl" style persona, such interjecting "like" and "totally" into her sentences and speaking in a more haughty demeanor. She's friendly, albeit pushy, and even claimed Makoto is an "omega male" due to his passive nature when she spent time with him. Her persona is mentioned to be based on a script Junko made for her, and while not a reflection of her true personality, it speaks to how Mukuro views her sister and thinks how she would act.

While she is able to fool her amnesiac classmates during the Mutual Killing Game, she slips up several times when she lets her guard down. For example when speaking to Makoto on a date in the garden during School Mode she mentioned missing her ghillie suit quickly correcting that it was an "Oscar the Grouch" suit instead. Other examples are one of her favorite presents being the "Ration" item, enjoying any and all kinds of food noting she's not picky when it comes to it, and mentions playing first-person shooter video games.

Mukuro is extremely loyal to and loves her younger twin sister Junko and follows her every order, no matter what it is or how Mukuro feels about it. This includes, but is not limited to, breaking and entering, kidnapping, committing murder, physical assault, performing lobotomies and so on. She is also very protective of Junko, seen when she tried to attack Izuru when he stomped on Junko and voicing concerns if she feels her sister will come to harm. However, in turn Junko is cruelly abusive towards Mukuro, often physically, emotionally and mentally tormenting her in a variety of ways, such as insulting her looks and weight, hitting her with a bat, and taking advantage of her insecurities.

Due to the constant abuse, Mukuro developed a deeply and unhealthy sister complex. She turns ecstatic and feverish when thinking about or explaining Junko's relationship with her and despair, considering her own relationship with Junko special because she truly is the only one who understands her. She claims that is why Junko needs her, though she's pretending she hadn't realized it yet, believing Junko is "shy". When gushing about this to an amnesiac Ryoko Otonashi, Ryoko is deeply disturbed and concluded that Mukuro's feelings for her sister are definitely not normal. (Danganronpa Zero)

She also finds pleasure in Junko's attempts to harm and kill her, believing that her sister will experience tremendous despair if she succeeds, and to Mukuro, that means she loves her in turn. (Despair Arc)

Despite her dedication to her sister, Mukuro expressed some hesitancy towards their end goal. In her final Free Time Event with Makoto, she vaguely alluded to concerns of maintaining the "same dream" her entire life since childhood. She wondered out loud to Makoto about changing her dream or even finding one of her own. Ultimately, this doesn't stop her from moving forward with Junko's plans and her subsequent execution.

As shown in the non-canon Danganronpa IF novel and Danganronpa S: Ultimate Summer Camp alternate universe, Mukuro is capable of befriending and becoming attached to her classmates. However, in both instances she still cares deeply for Junko even as her bonds with her other classmates deepen. When she talks to Monokuma in her "My Future..." event she claims she'd be extremely distraught if ordered to kill them, and would still do so, but she questions and eventually decides that if she were to bring true despair to her sister as Junko wanted to experience, she would ruin her plans and go against her orders.

In Danganronpa IF, Junko mentions that Mukuro developed romantic feelings for Makoto during their two years as classmates (and the narration further states that Mukuro had considered asking Junko to exempt him from the Killing Game before her failed execution) but could not bring herself to act on them. After Makoto saves her life those feelings, combined with her growing doubts over betraying her classmates and Junko's decision to cut all ties with her making her realize that she had never understood her sister at all, helped her find the determination to seek out a new dream. She is genuinely shocked to hear that her classmates are willing to forgive her for role in The Tragedy and still see her as their friend despite knowing that she was responsible in part for the Killing School Life, as she was certain that they would all despise her for what she did to them. While Mukuro still wishes to make Junko happy, she realizes that the only way she can give Junko the despair she craves is to make amends for her past actions, save her classmates, and put an end to Junko's plans. She also expresses regret for her previous crimes, accepting that when the students leave for the outside world she will be hunted down by Ultimate Despair as a traitor and reviled as a criminal by everyone else but resolving to live on and protect the hope that Makoto gave her until Ultimate Despair is stopped for good.

At a young age prior to being a teenager, Mukuro left her family while they were in Europe to be recruited and trained in the elite mercenary group based out of the Middle East named Fenrir Mercenary Group, who engaged in direct combat. During her time spent in the group, she never received a single injury on the battlefield. (Danganronpa: Trigger Happy Havoc)

Due to her training she is highly proficient in both a variety of firearms, knives, explosives such as grenades, and hand-to-hand combat to the degree she is able to hold her own, or even defeat equally as trained individuals such as several of the Madarai brothers (Danganronpa Zero), the Ultimate Swordswoman Peko Pekoyama, and security personnel from Hope's Peak (Despair Arc). However, she was quickly outmatched by Izuru Kamukura due to his talent of the Ultimate Hope (Despair Arc) and estimated that she could not defeat Sakura Ogami, the Super High School Level Fighter, in unarmed combat (Danganronpa: Trigger Happy Havoc IF). Using her skills, she easily and mercilessly slaughtered an entire middle school on Junko's orders. (Danganronpa Gaiden: Killer Killer). Under certain circumstances, she has demonstrated the ability to go into a trance that lets her display abilities that go beyond even the level of Ultimate, fighting off an entire army of Monokumas at once with only a sharpened metal rod while also avoiding machine gun fire (Danganronpa: Trigger Happy Havoc IF).

Mukuro also show cased the ability to perform quick first aid treatment, likely should she need to treat herself or her comrades during her time as a mercenary, and showcased enough experience to provide someone with enough treatment to prevent them from dying, as seen when she saved Naegi in a possible alternative universe. (Danganronpa: Trigger Happy Havoc IF)

She is also able to deflect (most) attempts on her life by her sister Junko while carrying on a normal conversation with her, such as blocking an icepick and kicking a grenade out of a car window, which is exceptional due to Junko's analytical talent. (Despair Arc)

Mukuro underwent comprehensive survival training that encompassed essential skills such as fire starting, mastering the use of a ghillie suit for camouflage, and honing her ability to navigate and travel to various locations, including Southeast Asia. These acquired survival skills were a testament to her diverse and rigorous training experiences. (Danganronpa: Trigger Happy Havoc)