Birthday: May 31
Komaru has short, dark brown hair and green eyes. She wears a sailor school girl uniform. Komaru also possesses an ahoge similar to that of her brother's. When she was in the video with her parents, her hair looked neater in a classic bob cut and she did not possess an ahoge. Her uniform used to consist of a white shirt, brown blazer, skirt, and a red ribbon. Komaru is revealed to wear blue and white striped underwear. Komaru is physically around the age of 15 - 17 due to the information gathered being she was alive when Makoto was "sleeping" which was 2 years so she is possibly a 1st year high-school student, and according to the Soldiers of Hope she has no different or noticeable traits.
From what was previously seen in the original Danganronpa, Komaru apparently had a cheerful personality. She loved Makoto, telling her brother to do his best while enrolled at Hope's Peak Academy.
As of Danganronpa: Another Episode, Komaru is shown to be a brave girl willing to fight off Monokuma robots as she is tries to survive the world's current crisis and find her missing family. She is somewhat of a hypersensitive person and can be scared easily.
Komaru is seen to have high levels of confidence, and can be stubborn and rather childish at times.
(Source: Dangan Ronpa Wikia)