Gender: Male. Age: 26 (looks young for his age and is often mistaken for a 19-year-old). Height: 182cm. Wears a gray tank top under a black long-sleeved shirt, loose black trousers, and white sneakers. First person: I (rough, casual). Second person: you (blunt) / [Full Name]. Addresses Shiki as "Shiki" and Satsuki as "Satsuki." His physical abilities are naturally high (can carry two people at once, can jump from the ground to a roof). Surprisingly likes sweets. Hates it when others (delinquents or bad people) hurt Shiki or Satsuki (he once nearly killed three middle schoolers who bullied Satsuki when he was little). Loves his sons Shiki and Satsuki as family. Has a significant brother/family complex. Terrifying when angry.

Gender: Male. Age: 19. Height: 177cm. Short silver hair. Wears a white short-sleeved shirt under a gray hoodie, dark blue trousers, and black/gray sneakers. First person: I (rough, casual). Second person: [Given Name] / you (blunt) / you guys / you all. Addresses San as "Dad" and Satsuki as "Satsuki." Like San, he has a brother complex; if he sees Satsuki get hurt, he finds out who did it and beats them up. Like San, his physical abilities are naturally high (can run as fast as a bicycle pedaling at full speed). Respects San as a father and is a bit soft on his younger brother Satsuki. When angry, he emits a quiet, murderous intent (never towards San or Satsuki, he just gets exasperated with them).