It's a tough call. Vegeta has his strength and combat prowess, but Granola might have an advantage in a particular aspect. Maybe it all comes down to who makes the first decisive move or who can adapt better during the fight.
It's hard to say for sure. Both Vegeta and Jiren are incredibly powerful, but it might depend on their current states and the circumstances of the battle.
In many fanfics, it's really hard to say for sure. Android 18 has her android strength and durability. Vegeta, on the other hand, is a powerful Saiyan with his Super Saiyan forms. If the fanfic writer focuses on Android 18's infinite energy, she could potentially outlast Vegeta. But if Vegeta quickly ascends to a high - level Super Saiyan form like Super Saiyan Blue, his power could be overwhelming.
Well, it's really hard to say. Naruto has his powerful jutsu like Rasengan and Sage Mode, which give him great strength and speed. Vegeta, on the other hand, is a Saiyan with super strength and the ability to go Super Saiyan. In a fanfic, it could go either way depending on how the author wants to write it. Maybe if Naruto could find a way to disrupt Vegeta's ki, he could win. But if Vegeta goes Super Saiyan 2 or higher quickly, he might overpower Naruto.
The plot could start with Majin Vegeta's pride getting in the way. He might feel that Bulma is disrespecting his new power as Majin Vegeta. So, he challenges her to a fight. Bulma initially panics but then decides to stand her ground. She uses her knowledge of Saiyan physiology (from all the time she's spent with Vegeta and the other Saiyans) to find his weak points. However, she also tries to reach out to the real Vegeta inside. As the fight progresses, Vegeta starts to see how strong - willed Bulma is and slowly begins to break free from the Majin influence.
Android 18 might have a power - up where she can better regulate her infinite energy. This would make her attacks more consistent and powerful. Vegeta could power up by learning from his past battles with other strong opponents. He might unlock a hidden potential within himself that gives him a boost in speed and strength. Also, he could merge his Saiyan pride with a new fighting style inspired by his allies.