Takashi's friends who acts like a cool biker. He became a magician and gained destruction magic.
Kazumi Ida is one of Takeshi's friends who is a wannabe biker so he pretends to be a bully around others. Soon after Takeshi was accidentally turned into a magician, Kazumi was revealed that he is one also (after he came on contact Hotaru's magic). He has a distinct trait of talking with an Osaka dialect.
Kazumi bullies others to make the impression of a typical "superior delinquent student." It is also shown that he has sister complex.