He has short black hair and heterochromia. At school, he wears the standard Yumenosaki uniform, consisting on plaid pants, a blazer with a sweater vest and a necktie. For Valkyrie, he wears a frilled jacket and a long coat with boots.
He is very devoted to Shu Itsuki because he called out to him when he was alone. But Shu ignores and belittles him in return. He has an honest and gullible personality, but can easily become lonely and broody. He likes cute and scary things, but has very few friends because he has difficulties finding people who share his interests. He has a complex about his girlish name and mismatched eyes. Mika has a heavy Osaka accent and has a lot of part-time jobs to support Valkyrie, since Shu doesn't like to deal with crowds.
Anzu likes him because he resembles her friend Suzu Kuromori. Unfortunately, Mika tries to avoid her because Shu resents her for defeating Fine with Trickstar. They eventually became good friends, with Anzu befriending him the same way she did with Suzu in the past.