Azul Ashengrotto

Azul Ashengrotto is a second-year student and the head of the Octavinelle Dormitory. He manages Mostro Lounge, a café located in the Octavinelle dormitory building. Though he claims to help others out, the wishes he grants often come at a price. His family runs a very famous restaurant back in the Sea of Corals, however Azul dislikes it. He knows how to play the piano, and was in a band with Jade (contrabass) and Floyd (drums) in middle school.

His unique magic is called "It's A Deal". As long as someone signs a contract with him, he’ll be able to confiscate one of the target’s abilities. This can be a magical ability or a physical capability, such as a beautiful singing voice or ability to swim fast. If the target doesn’t fulfill the contract's conditions, they're bound to work under Azul indefinitely.

(Source: Twisted Wonderland Wiki)