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.
There's 'The Unspoken Feelings'. This fanfiction really focuses on the subtleties of Goku and Vegeta's relationship. It's full of moments where they start to understand each other on a different level, which is really interesting to read for fans of this pairing.
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 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.