Grrl Power VII: Let Me Explain For The Next Thirty Comics!

[Shining Wrath]

This guy attacking right now is very much not Cthilla - having the face wrapped up is the only similarity here. The attacker is very much human as was shown in his first appearance, while Cthilla is very much not to the point where they are not sure if there is any other being like them.

As for working with Cthilla, in of itself one could make the same argument as for Roy working with Belkar. Details however may vary.

As to Roy working with Belkar, we have the word of Lawful Good Deva that Roy brought his evil back down under the "Love Child of Sauron and Cruella de Ville" line.