[@Sadu] His plan changed from game to game.

KHBBS: I am Xehanort and my plan is to brainwash a bunch of kids to make a X-Blade that will let me restart an ancient war that i have no idea who it was between or what it was over... That failed, my new plan is to kill myself and let the next 2 of me figure things out.
KH1: I am Ansem, i want to use the power of Kingdom Hearts to take over the World
KH358: I am Xemnas and i want... You know what, nobody gave a fuck about this game.
KH2: I am Xemnas, i'm gonna make my own Kingdom Hearts with blackjack and hookers.
KHDDD: I am Xehanort and i'm gonna use time-travel and shit to revive the 13 guys you didn't give a shit about in the last game, because Nomura is literally just flinging shit at the wall to see what sticks.
KHREC: Nothing happens
KH3: I'm Xehanort and turns out every time that you defeated me before WAS ALWAYS PART OF THE GRAND DASTARDLY PLAN TO CLONE MYSELF 13 TIMES in order to restart that war that i still know nothing about, because... I still don't fucking know. Also, apparently i'm a tragic good guy now? Also, apparently the guy with the eye-patch was the REAL bad guy all along.