Michibata Karin

She has a lisp and her thoughts are always the same as when she was a little girl.

For some reason, she is taken good care of by the other mamans so she can live without any inconvenience. She has no ability to provide for Takeshi though. But her kindness is greater than any of the others.

The other mamans call her Karin-sama. Even Takeshi is overly attentive to Karin.

She loves flowers. She has no inhibitions regarding sex. Her toy duck "Yosshii" is her precious pet and friend.

Spoiler

She would always offer herself to receive the worst punishments by Takeshi's late father in order to protect the others. It damaged her mental health greatly, and is the reason why everyone is protective of her.