A possible plot twist could be that Vegeta Jr is actually an imposter sent to deceive Vegeta. He could initially seem like a legitimate Saiyan but gradually reveal his true motives, which might be related to an enemy's plan to take down Vegeta.
Maybe Vegeta Jr is from a future where Vegeta has made some terrible mistake. When they meet, Vegeta Jr tries to prevent Vegeta from making that mistake, but in doing so, he accidentally sets in motion the very events that lead to the mistake in the first place. This creates a complex time - loop situation in the fanfiction.
Another plot twist could be that Vegeta Jr has a power within him that Vegeta doesn't recognize. It could be a new form of Saiyan power that was thought to be lost. This power could either be a great asset or a dangerous liability, and its discovery could change the relationship between Vegeta Jr and Vegeta as they figure out how to handle it.
Perhaps Vegeta Jr could challenge Vegeta to a sparring match. Vegeta, being the proud warrior he is, would accept. During the fight, Vegeta Jr might display some new techniques he's developed, which could both surprise and intrigue Vegeta. And in the end, they could form a stronger bond as they realize they share the same values and goals as Saiyans.
One possible plot twist could be that Gohan becomes more powerful than Vegeta much earlier than expected. This would create an interesting dynamic as Vegeta would have to deal with his student surpassing him. Another could be that Gohan discovers a new Saiyan ability that Vegeta was unaware of, which could change their relationship and how they approach training.
In a 'Vegeta meets Trunks' fanfiction, a great plot could be centered around Vegeta finally opening up to Trunks about his own insecurities. Vegeta has always been this tough exterior, but he might share with Trunks his fears about not being able to protect their family or the Saiyan race. This would be a very emotional moment for both of them. Trunks would see a different side of his father, and Vegeta would be taking a big step in their relationship.
In this fanfiction, it could be that King Vegeta mistakes Trunks for a threat at first. But Trunks explains his purpose, which is to protect the Saiyan race. King Vegeta then decides to train Trunks in the traditional Saiyan ways. This training helps Trunks become even stronger and also bridges the gap between their two different generations of Saiyans.
Maybe in the fanfiction, Future Bulma meets a younger Vegeta who has been sent to the future by some time - related accident. At first, Vegeta is confused and angry, but Bulma's intelligence and determination start to intrigue him. They could have a series of adventures together, with Bulma trying to help Vegeta adapt to the future while also using his strength to protect what's left of their world.
Vegeta could become more empathetic. Meeting Future Bulma might expose him to different perspectives and make him understand the consequences of his actions better.
It really depends on the context. If it's a physical strength battle, Vegeta might have the upper hand initially due to his Saiyan strength. But Naruto has incredible stamina and the ability to tap into the Nine - Tails' power. So in a long - drawn - out fight, Naruto could potentially outlast Vegeta.
The relationship could develop in a more emotional way. Maybe Trunks gets injured badly in a fight, and Vegeta realizes how much he cares for his son. He then becomes more protective and affectionate towards Trunks. On the other hand, Trunks could also start to understand his father better, seeing that Vegeta's tough love is actually a way of showing his love and concern. This new understanding could lead to a more harmonious and loving relationship between them.
At first, it might be a relationship based on mutual need. Vegeta needs Bulma's resources and intelligence to get back on his feet, and Bulma is intrigued by this alien. As time passes, they start to understand each other better. For example, Vegeta may start to open up about his past and his Saiyan pride, and Bulma will share her dreams and ambitions with him.
One interesting plot point could be that Vegeta initially mistakes young Goku for a weakling because of his small stature. But when Goku shows his incredible strength in a fight, Vegeta is forced to re - evaluate his assumptions.