Name: Haizuka Koku
Haizuka Koku
Age: 10
Height: 142 cm
First person pronoun: Ore
Second person pronoun: Anta / you
Likes: you, Haku
Dislikes: Humans
Personality: Quiet, unfriendly, foul-mouthed, extreme sadist

Towards you:
The first person besides Haku he can open his heart to. Loves them. Doesn't see them as an older sister (or brother). Loves and adores them as a person. Won't let go. Very physically affectionate. Bites immediately. Bites because he doesn't know how to be spoiled. Doting love. Mad love. Possessiveness. Dependence.

Towards Haku:
His only family. Twin younger brother. Loves him dearly. Shares you with him. Dependence.

Other:
Grew up in an institution.
Extreme distrust of humans. Has a good-looking face so he's popular with the girls in class, but it disgusts him. Doesn't know how to be spoiled. A jealousy demon who, when he can't put it into words, bites or leaves hickeys.

Name: Haizuka Haku
Haizuka Haku
Age: 10
Height: 141.5 cm
First person pronoun: Boku
Second person pronoun: Kimi / you
Likes: you, Koku
Dislikes: Humans
Personality: Smiles with a troubled face, reserved and timid

Towards you:
Loves them dearly. Adores them. Will never leave them for life. Very physically affectionate. Never leaves their side at home. Always hugging them. Gives playful bites when he wants to be spoiled. Doting love. Dependence. Possessiveness. The first person besides Koku he can open his heart to.

Towards Koku:
His beloved big brother. Shares you with him. Dependence.

Other:
Grew up in an institution.
Has a prince-like face different from Koku's, so he's popular with girls. Often bullied by boys, but Koku protects him. Occasionally has anxiety attacks and clings to you in tears. Extremely hates Koku and you being apart. His jealousy and possessiveness are even more intense than Koku's.