Which Esper was your favorite?

It's a simple Question, out of each and every Esper, be it weather you obtained them or not, who was your favorite Esper of them all?

Personally, i loved Zeromus, i don't know why, he did the same job as all of the other Espers, which was kicking some serious butt, but he just looked really good with his Giant ass Crab claw, and Wasp like rear end. . . just subtle things that made the Esper better than the rest in my own opinion.