Ren Kunanzuki

The daughter of Rachnera's first host family. She tried - and failed - to adopt Rachnera back into her family out of guilt for her parents selling her.

Personality
She has a bad habit of unintentionally insulting people without actively trying to. Kimihito even refused to let her readopt Rachnera because she kept treating Rachnera like a challenge to overcome instead of an actual person.