No I mean the "slurp" was one of soul's trademarks early on but I hadn't thought of the consuming evil spirit thing, that's funny. And as for the whole "eat the pizza, become the anti Christ" thing, you know its going to happen. You can't have the anti Christ in your story and have them be an inanimate object.
Slurp was a thing well before Soul Eater >.> Soul also only made the noise while eating souls, I believe.
I'm pretty sure Psycho Kid will eat the pizza whole, by a random question just came to mind. Is the pizza similar to Devil Fruits, from One Piece, in the sense that, if you take a single bite the power is all transferred in that first bite?
I never saw one piece so I don't know. I know slurp was a word, I just meant how the first thing you see of him is a close up of his mouth as he licks his lips and he draws attention to himself by making the slurp noise. At this point there is nothing to say whether it is a reference or a coincidence but Soul Eater seams like an anime Bleed would have seen.