Okay, I'm still stuck on the "me, myself, and I" part of the clue. So, let's throw in the clue about Maruno and we will get Toon Summoned Skull, which has been guessed and was wrong. But when you mix the clues you get
Summoned Skull
Skull Archfiend of Lightning
Toon Summoned Skull
All part of the same, (me, myself, and I) but different.