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Johnny Crasher is a former stuntman who now teaches a stuntman certification course. During his career as a stuntman, he sustained many injuries, and was in a coma over forty times.
He is an overweight man with a graying mullet, dressed in a red-white-and-blue jumpsuit and cape similar to Evel Knievel's. Owing to his many injuries, he also wears a neck brace and a blue glass left eye, which is always pointed at an extreme upward angle.
He is rather eccentric and forgetful, likely due to the forty-plus comas he's been in over the course of his career, and he says as much when introducing his class to Mordecai, Rigby, Muscle Man, and High-Five Ghost. He also suffers from excruciating headaches, most noticeably when angry or annoyed. He is also sarcastic at times.
- He may be a reference to Evel Knievel, as both were stuntmen, both were injured multiple times, and both wear similar outfits.