Oh, so much. Long story time: In both Bleach and GT Fuu was born to two high-ranking warriors and was trained by them both, so she had an e g o and a lot of privilege- her parent's subordinates respected her because 1. they had to and 2. she annoyingly had the skills to back it up. Fuu in her youth was an intense perfectionist, not smug but definitely acted like she was above it all and better than everyone else (and sometimes she was! Which was a pretty big feedback loop of ego for her). She was impatient with people that couldn't keep up with her and burned a lot of bridges and earned herself a reputation as a bit of an asshole. It's not like she was mean on purpose, she just made it clear she had no time for people that would inhibit her ambitions and never made any lasting relationships (except for Jun!). As she grew up, she suffered a variety of huge losses in her life which tempered her ego and gave her a very in-your-face lesson in humility, and someone she very much respected told her she'd never achieve anything great with that attitude and disregard for others weighing her down. (in GT and Bleach the order here is different buuut) basically she takes on a variety of students who she ends up learning almost as much as they learned from her, and her son is killed and she finds out he was hiding from her that he never wanted to be a warrior, but he was too afraid of what she'd think of him if he said no to her (he was terrified of disappointing her). That was the final crushing blow to Fuu's ego, and now in her older age she's an extremely patient, if not still curt, person who still has a difficult time expressing warmth or obvious love to people she cares deeply about. She harbors a lot of guilt and responsibility but very much tries to keep that all to herself and not project it onto the people around her. Still very serious and professional, and doesn't appreciate prying of any kind.
