7: He references the 7 from 7 Eats 9, and is abusive to 6, and when 7 gets bored, he tries to eat 6, but fails all the time, maybe in his episode, he grabs 6, and him and 6 go to planet Z, for 7 to cause havoc, however, 6 might help the letters. And maybe he might appear in 7.2.
Mike Salcedo