Kaito Sakashita

Kaito Sakashita (坂下 怪人, Sakashita Kaito) is a character who first appeared in the Chapter 7.X Omake Chapters. He is a former elementary school 6-2 classmate and childhood friend of Kenji Yamashita.

History
According to Kenji's POV, Kaito was always bullied in the class. Kenji used to always protect him, and the former considered him a minion.

Etymology

 * The name Kaito means "phantom, mysterious person" (怪人).
 * Kaito's surname Sakashita means "slope, hill" (坂) (saka) and "under, below" (下) (shita).