Natsumi is the mysterious yet familiar Ultimate Track Star. Natsumi has a 'girl next door' vibe to her that makes it all the more confusing when she refuses to tell certain things to the others. These things include her last name, her birthday, and even her blood type. She's a kind soul, but gets annoyed easily when people aren't clear or honest with themselves or others. Natsumi suffers from narcolepsy, falling asleep at inopportune moments. It never lasts for long, and doesn't happen very often.

As the Ultimate Track Star, Natsumi is a master at all track events during track and field. This includes the hundred meter dash, high jump, and hurdles, just to name a few. She's also a model student, trying her best to get into a good college to make her family proud.

Natsumi has a medium voice. She speaks clearly, and with some authority. However, she still gives off a kind and caring vibe, as if she's only ever stern out of concern for others. If I had to compare her voice to a canon Danganronpa character, it would be closest to Mahiru Koizumi, but I'd recommend not getting too hooked up on that.