Speaking of Pizzahead, we should probably discuss what we're going to do with his page so we don't need to do content revisions afterwards. I remember seeing a blog post of him that was merged with the Pizzaface character, but I'm not sure if they should really be listed on the same page. Pizzaface is a separate entity from Pizzahead, with his own set of abilities.
Here's the abilities I remember each character having, as well as justifications for each.
Pizzaface: Body Control (shifts parts of his face around), Flight (is constantly flying), Inorganic Physiology (is either some sort of machine or a big sentient pizza), Intangibility (floats through walls during Pizza Time), Summoning (the enemies he spits out and that cog he drops), Superhuman Physical Characteristics (self-explanatory)
Pizzahead: Acrobatics (does somersaults through the air), Cloth Manipulation (his clothes changing), Elasticity (his arms stretch), Explosion Manipulation via dynamite, Reality Warping (made a celestial body have his face on it), Regeneration (several examples throughout the fight, such as recovery between phases), Superhuman Physical Characteristics (self-explanatory), Vibration Manipulation (sumo stomp shockwave), Weapon Mastery (uses a gun)
Pizzahead could potentially also have Toon Force as the reality warping he displays is generally for comedic effect and not for combat.
There could be abilities I missed, but I feel this is a fairly good list so far.