Ren

A mysterious girl whose existence is similar to Mare's. For some reason, she looks over Chinami and sometimes even does her homework. Chinami calls her "Fairy-san". She is easily amused, but gets embarrassed when somebody pats her head.

Spoiler

Ren is actually a grim reaper from another world just like Mare, and Taiga's partner. She also hung around Tenkuru's members when Mayaka, Souichirou and Shino were part of it.