I actually like Master Xehanort's design (dat jacket, tho), mannerisms (his reverse armfold, his hand gestures, how he sits in his Organization chair, etc.), and voice (R.I.P., Mr. Spock).
Not to mention him raising mountains, spawning Keyblade twisters, and making peoplesicles.
P.S.: Everything else about him (his Black Hole Sue effects on the story, his utterly stupid "time-traveling Horcruxes," etc.) still sucks, though.