Anyway, Ultemecia has all forms, including Greiver and her final form. Count Bleck wields the Chaos Heart and Dark Prognosticus. Time Compression is in effect. The Void is in effect. The battle takes place at Castle Bleck and may move from there.
The only limit is no mind manipulation. Ultimecia may create an abstract from Bleck's mind, but may not charm or otherwise attempt to control him.
All right, then, which existence eater takes the win?
Something you might need to know about this wiki is that, because of 4th wall breaking in Super Paper Mario, almost all references to death are replaced by "game over." To kill someone is to end their game, and send them to the Overthere (heaven) or the Underwhere (hell), which is referred to as the aftergame. I find it hilarious, but useful.
But back to the battle, Count Bleck and Ultimecia are pretty similar, as far as I can see. Bleck can control space and time, and his weakness is True Love. Pretty similar.
Three Mario characters, at least. Count Bleck, Dimentio, and Luigi. Yes, that Luigi. He's basically the Mario equivalent to the antichrist, since he was prophecised to erase all of existence. Again, yes, it's Luigi.
However, I wasn't aware that there was a Void in Final Fantasy. Now that I've read about it, they are very similar. Anyone think Ultimecia can win against Count Bleck?