Hikari is a tanned skin girl with violet eyes and short black hair. She wears the Nagoya Butei Girl's School sailor suit, which is trimmed short everywhere, leaving her entire abdomen exposed.
Hikari was shaken up by the event of the Mamiya Family massacre to where she became lost from constant hiding from IU. This has lead her to be dissatisfied with the state of her clan and wanting to rebuild it again.
During Hikari's childhood, she got along well with Akari. However, after IU assaulted her family and fragmented her clan, she was forced along with her younger sisters, Nozomi and Kodama, into constant hiding.
- Hikari appeared on a volume cover of the AA series.