HikariYami

Hikari
A skinny, short girl. Her silky smooth looking hair was as white as snow and only fell down right above her shoulders. Her breasts could not even be seen through the large long, pure white coat that was clearly too big for her, completely covering her mouth, only showing her beautiful white eyes, eyebrows and nose. Despite her hair being white, she had fair, smooth skin making her look no older than any other student, the look of pure joy in her white eyes. She looked almost like a cute ghost.

Yami
She's exactly like Hikaru but everything that was white becomes black when she's taking over.