X-Men: What Happened To Everyone Who Became The Phoenix?

The woman that's known as 'The One True Phoenix' takes up the mantle of Phoenix after she hears that her mother, Jean Grey, is dead.

The thing that sets Rachel apart from everyone else on that has ever had contact with the Phoenix Force is that she's one of the very few to hosts that's never corrupted by it.

Instead, Rachel uses her power for good and can always be relied upon to fight on the side of right no matter what universe or timeline she finds herself in. Which is why this entry is so short as she never does anything that could lead her to the dark side of the Phoenix's powers.

All in all, Rachel is a good egg even after she loses her connection to the force thanks to Jean Grey taking it all back for herself.