Koku

 is a character in  The Beginning. リリィの父が営むヴァイオリン工房に見習いとして出入りする少年. ある人物を探し続けている. 異形の怪人に変身する能力を持つ.

Personality
he is op as fuck

Appearance
Koku has heterochromia iridum.

Relationships
ele muito gato e gostoso

Etymology
The kanji in Koku's name are black (黒) and feather (羽).