Shermy

Shermy is a character who appears very rarely in the Peanuts franchise. So far, Shermy has only appeared in one Peanuts parody, Ren McCormack

Ren McCormack
In this skit, Shermy is seen doing "The Running Man" while dancing with the Peanuts gang. When Ren McCormack complains about the gang just doing the same moves over and over again, he also questions Shermy's dance, asking "what's this kid even doing?", to which Shermy replies that he couldn't think of a dance, and that he panicked. After Ren leaves the school because of the horrible dancing, Shermy resumes dancing with the others.

Shermy was voiced by Seth Green, who also voiced Schroeder and Pigpen in this skit.