A lot of 'dbz goku x vegeta fanfic' has the theme of redemption. Vegeta, in particular, has a complex past, and in these fanfics, his relationship with Goku can be a part of his path to redemption. Also, the theme of family is present as they both have families and their interactions can be influenced by their family values. There's also the overarching theme of the Saiyan pride that they both carry and how it affects their relationship.
One common theme is rivalry - turned - friendship. Their initial intense rivalry gradually transforms into a deep bond as they face various threats. Another theme is power - up. They often find new ways to increase their power together, like in some fanfictions where they discover a new fusion technique.
One popular story could be 'The Bond Beyond Rivalry'. It explores a deeper friendship between Goku and Vegeta as they face a new, extremely powerful enemy together. Their combined power and the way they start to understand each other on a more personal level makes it an interesting read.
It could develop in a rather comical way at first. Goku's simple - mindedness might annoy Female Vegeta who is used to a more formal and proud Saiyan environment. But then, when Goku shows his incredible power and determination in battle, Female Vegeta would be intrigued. As they interact more, she might start to understand his way of thinking and they could form a bond. For example, during a long and tough battle against a strong foe, Goku's positive attitude might inspire Female Vegeta to fight harder, and that could be the start of a deeper connection.
One interesting plot could be that in an alternate universe, Goku and Female Vegeta team up to face a new and powerful enemy. Their different fighting styles, Goku's carefree yet determined approach and Female Vegeta's proud and tenacious nature, would create an interesting dynamic during battles. They might start off not getting along well due to their pride but gradually learn to respect and rely on each other as the threat becomes greater.
Well, there's a fanfic called 'Goku and Vegeta: A New Alliance'. In this one, they are forced to team up in a way that they never have before. It's interesting because it explores their different personalities and how they learn to work together. It also has some cool plot twists that keep you reading.
In DBZ Vegeta and Bulma fanfiction, there can be alternate universes explored. Maybe in one universe, they meet under different circumstances. For instance, instead of Vegeta coming to Earth as an enemy, he could be an ally from the start. This would completely change the dynamics of their relationship. It could lead to a more romantic and less combative start to their relationship, and the fanfiction could explore how this different beginning affects their future together.
There is a fanfiction called 'Baby Vegeta's Training'. In this, it details how baby Vegeta, despite his small size, still tries to train and become stronger. It's interesting as it gives insights into his character and his unwavering determination to be the best, even as a baby.
Perhaps in this fanfiction, there's a lemon - loving alien race in the DBZ world. Bulma, being the curious scientist, wants to study them, and Vegeta is dragged along. Along the way, they face challenges that force them to work together in new ways, and their relationship deepens as they navigate through this lemon - related encounter.