Kaguya Otonashi

The student council president of the Magic Division. She is also the strongest magika student in the academy.

Kaguya is a sweet girl who has a very warm and cheerful personality, she is willing to help anyone in need. Kaguya can easily talk to people who she just met, she is like an older sister to everyone in the Witch's house. She is very kind-hearted and care-free; she instantly became interested in Kazuki upon their first meeting and wants to guide him as his Magika senior, much to his sister's dismay. She is also very flirtatious when it comes to Kazuki.

(Source: Magika no Kenshi Wiki)