He becomes more aggressive. Usually, Vegeta is already a rather aggressive character, but when jealous, he can be over - the - top. He might start unnecessary fights or challenges, just to assert his dominance. For example, if he's jealous of someone getting close to Bulma, he might challenge them to a fight without any real provocation.
Often, Vegeta becomes more in touch with his emotions. He starts to care about things other than just fighting, like his family with Bulma. He may show more love and protectiveness towards her and their child.
His confidence would skyrocket. Naruto has always been confident, but with Madara's power, he'd have a new level of self - assurance. He'd know he could handle almost any threat. His sense of responsibility would also grow. Since he has such great power now, he'd feel an even greater obligation to protect his village and friends.
His anger might make him more reckless. Usually, Ichigo is a fairly level - headed fighter, but when he's pissed at Rukia, he could start making hasty decisions in battle or in his relationships. For example, he might go after an enemy without a proper plan just to prove a point.
He could become more empathetic. If the quirk makes him experience something difficult like the pain of others or a disability, it might make him more understanding of those around him who are less powerful or have faced hardships.
His power level would skyrocket. He could get access to Kami's knowledge and abilities, which would make him extremely powerful in the ninja world.
Sasuke's personality would change quite a bit. His pride would still be there, but it would be expressed differently. He might be more aloof as a cat, not wanting to be coddled. He'd also be more territorial, marking his space in ways a normal Sasuke wouldn't. And he'd be more independent, trying to solve his problems on his own even though he's now a small cat.
The Flash would start to view the world around him through a game - like lens. His relationships might even be affected. He could see his friends as 'NPCs' (Non - Player Characters) that he needs to interact with to gain certain benefits or complete side - quests. His daily routine of running around and saving the day would be more structured, with a clear sense of progression as he levels up his abilities.
He often becomes more self - reflective. When bound, he has to face situations that he can't easily escape from. This makes him look at his own actions and beliefs more closely. For instance, if he's bound to help the Gryffindors in a task, he starts to question his Slytherin - Gryffindor rivalry.
His life could change drastically. He might start to see the magical world in a different light earlier than in the original. For example, he could meet some early allies or enemies right after getting the letter.
Their relationship would likely become more intimate and committed. With a baby on the way, Vegeta would probably be more protective of Bulma. He might show his love in more practical ways, like making sure she has everything she needs.