Very interesting to see how Charlie presents himself. Presumably he has total control over his appearance in the thinkagram space. Who is he pretending to be in panel 8 though? I don't recognize the character. Presumably it's a villain of some type given his other forms: Emperor Palpatine, Dr Doom, Agent Smith, General Zod, Khan, Beetlejuice, the Joker. If I'm right about Charlie controlling his appearance, that also means he has knowledge of our pop culture. He might be getting that from the Arkendish, but does anyone else think it's likely he's from our world and was summoned into Erfworld somehow, like Parson?
Slately's transformation is a nice touch, though perhaps a little heavy-handed.