Lemegeton

Leme is a Diva, also known as "Lesser Key of Solomon" and is contracted to Hayashizaki Kazuki.

Leme speaks in the third person, and always refers to Kazuki as "King". She's very cheerful, and shows great interest in making Kazuki the Harem King. She is also not above showing anger and distaste to people who do inhumane things to people with magic and while viewing them tools or weapons.

However, she is also quite apathetic, being able to solve the major problems of Kazuki not being recognized and causing the turmoil of the school when Kazuki was hunted by Kaguya by simply uttering a single sentence, but stubbornly refusing to do so.

(Source: Magika no Kenshi Wiki)