Kokubu Rikako (国分リカコ) was Karin's 34 year old mother. She worked as a designer of children's clothes.
Rikako's voice is done by
In episodes 1 and 2, Rikako's voice was done by Hikita Yumi (引田由美).
[Tonde Buurin characters]
(c) Nippon Animation Co., LTD.