It appears, as his costume in the film version suggests, that he is considered a type of superhero in the Jellicle society. In the film version, Rumpus Cat is played by Frank Thompson who also plays Admetus.
It seems, as his attire in the movie version indicates, that he is regarded as a kind of superhero within the Jellicle community. In the movie version, Rumpus Cat is portrayed by Frank Thompson who also plays Admetus.