Mike was one of the applicants for the job of morning announcer after Gordon Stoltski, the previous morning announcer, is killed in "Dances with Smurfs". He tells Eric Cartman that the reason he is applying for the post is to raise his self-esteem.
Mike wears a gray t-shirt, a dark gray sweater vest, and dark grey pants.
He speaks with a severe stutter, not getting past the first word in the passage Mr. Mackey asks him to read. He has low self-esteem, most likely caused by his severe stutter.