I'm not sure if anyone has thought or commented on this, but I think that Vanitas is a Xehanort.
Reasoning:
Yellow Eyes
Is literally darkness
Since he is pure darkness then he would of killed Ventus first chance he got, UNLESS he had a part of Xehanort's heart in which he would react partially to Xehanort's plans
I'm not sure if anyone has thought or commented on this, but I think that Vanitas is a Xehanort.
Reasoning:
Yellow Eyes
Is literally darkness
Since he is pure darkness then he would of killed Ventus first chance he got, UNLESS he had a part of Xehanort's heart in which he would react partially to Xehanort's plans
...
Discuss or add on if you wish