Ryuuichi Kashima
Ryuuichi's basically a third parent to his little brother Kotarou at this point. The two are inseparable—he's constantly looking after him, babysitting, and generally being the responsible older sibling. Their bond is genuinely close, which makes sense given what they've been through.
Both their parents died in a plane crash when Kotarou was just a toddler. After that, Ryuuichi and Kotarou ended up living with the Chairwoman of their school and her Assistant, who took them in and became their guardians. It's a pretty unconventional family setup, but it works for them.
Content compiled by AnimeList.moe from publicly available sources.
