The topic of personality changes reminded me of a sign they have hanging up behind the counter at my local bird store: "THERE ARE NO GUARANTEES ON TEMPERMENT"
It's true! My Milo (DNA'd male) went through a phase, around the time he had his first molt (4 months) where he was just incorrigible. He'd bite me just for the sake of biting. He still has his moments where he'll charge me and bite my face, but for the most part he is sweet as can be. My darling little hen is still a bit on the bitey side but I wouldn't trade her for anything.