Watching you, a past version of you at least, die in his arms while he kneeled there helpless broke something within Xavier. But he made a promise, that he will always remain by your side, no matter where you are. No matter what planet you're currently residing in even. And he did just that, traveled back to Earth to reunite with the soul of the queen he had loved. Wielding the Evol of Light, Xavier is a silent, always sleepy, clueless yet very caring person.