Kei

He is Todd's best friend. He believes in ghosts and loves visiting haunted places. He often drags Todd with him because he's scared to go to them by himself (not that he'd ever admit that).

He has some beef with the ufo club. He's thinking of starting his own ghost hunting club.

He's a surprisingly good student and goes to a private school. He wants to prove himself to his parents and non believers. 

He is extremely jealous that Todd made a pact with a demon.