Appearance

Komaru is a teenager around high school age. She has short, dark brown hair with a tint of green, and de-saturated green eyes. She also sports an ahoge, similar to that of her brother's, which developed as she grew. Overall, she is described as very plain-looking and "normal", which seems to be the same way people describe her brother. She wears the St. Koa Girls Academy uniform, which is a sailor fuku with a white blouse, a red necktie, and a turquoise collar, line trim, and skirt. There's a school crest on the bottom right of the back of the collar, necktie, shirt pocket and the outer sides of socks and also wears blue striped panties.

Personality

Prior to the Tragedy, Komaru had a cheerful and optimistic personality, somewhat similar to her brother. She loved Makoto, telling her brother to do his best while enrolled at Hope's Peak Academy.

But as the tragedy occurred, and Komaru was in the city run by children, Komaru began as a somewhat hypersensitive and quite cowardly character. She wavers between hope and despair as a result of her forced imprisonment. She doesn't want to have strong hope, because she believes it will be lost eventually, leading to worse despair. She has low self-esteem, considering herself boring, ordinary and weak. But she gained a desire to at least try to escape again. Komaru shows some childish traits, such as being naive, reliant, and easily excitable. She also has an 'unusual' kind of pride, as she gets really worked up from the puzzles of the Monokuma Kids. She is also very gullible. She is rather innocent as well and doesn't seem to have much interest in romance nor sexual things While a kind person, Komaru sometimes has a hard time relating to certain people and subjects, because she herself has lived a very ordinary life. Despite sometimes giving up too easily, there are other times which Komaru shows how stubborn and determined she can be. However, she has a weakness in complicated subjects such as basic computer science, but she does have moments where she is intuitive. . . . Komaru was one of the countless people who learned of the mutual killings committed by the high school students in Hope's Peak Academy when it was too late to stop it. She, like everyone else, had witnessed the Tragedy that plummeted the entire world into despair. During that event, she lost seven of her classmates during one of the many accidents resulting from the Tragedy and her friend Chieko disappeared. She kept telling herself that everything would be alright, but realized how hopeless it was when a group of unknown men attacked her house, separated her from her parents, and confined her in an apartment complex in Towa City when she was still a middle schooler.

One and a half years after Komaru's imprisonment, Komaru heard a banging on the door during her breakfast. She rushed up to the door and begged for help, only to be attacked by a Monokuma Unit. She hurried away, only to realize that the building was aflame. After escaping from the apartment, Komaru arrived in the streets. Afterwards, Komaru heard the sound of a girl laughing coming from the television, drawing her attention. She was surprised when she looked up at the TV, as she found the newscaster's corpse was being toyed with by a group of children. The children introduce themselves as the Warriors of Hope, who have but one goal: turning Towa City into the children's paradise, one without adults. This startled Komaru, who had to take quite a while to take it all in. . . . “Oh no… oh no no no…” 
Komaru mutters to herself in fear. She quickly leaving the area, wanting to find safe refuge or something useful. Her hands shook as she held the Hacking Gun, unshed tears in her eyes, this is too much to take in.

“Come on, Komaru.. calm down!”

she tried to encourage herself. It’s.. harder than she thought. She doesn’t even comprehend where she’s running too. But she sure won’t go back to the apartment complex.