Originally Posted by
PsychoEFrost
Not possessed? The D'Bari galaxy might have a few issues with that statement. She was also possessed on account of technically not really being alive during Endsong (though she regained some control fairly quickly).
Other than that, the current canon for the Phoenix isn't that terrible. Yeah, it got thrown around a few more times than needed, but the canon is consistent over the last ten years, which is more than other cosmic objects.
The major points are that A) It's a cosmic force that has existed since the beginning of time B) It's on the Celestial scale of power C) Jean is her favorite host due to her seeing beyond the bounds of life and death and her high empathic abilities and D) She lives through the emotions of her host, and therefore her power can override the will of the host in order to facilitate this need to live through emotion and E) She prefers Omega level telepaths as hosts but will bond with weaker beings during emergencies.
Past those five points is just subject to the will of the writer. Some good, some bad.
But the Phoenix being her ultimate form is from a time long since past, and pushed even further away by Jean deciding to take her own future into her own hands without the bird. It may be a positive step for the character.