Isshiki Suzu

A quiet monster. From his eyes, an unfathomable desire can be felt. Met Shirou when they were both child actors. Used to be called "Bell-chan" by Shirou, who mistook him for a girl. Tries to deepen his connection with Shirou again after a mysterious incident which reunites them. It is unknown why he poses as a fake white Icarus, as he is not a member of the Icarus squadron.

Spoiler

His true name is Berg Katze.