Kurousagi (also known as Black Rabbit) is a rabbit-eared girl who resides in the Little Garden and is the one who summoned the problem children. She often tries to be serious but easily gets flustered. When using her power, her blue hair turns pink as she gains increased power. This also happens at other times, such as when Izayoi promised his aid to her community or when enjoying a bath with the girls. One of Black Rabbit's gifts is the "Spear of Indra", a powerful legendary weapon that allows her to control lightning.

 

 

Informations Source: Wikipedia