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.
There's also 'The Unspoken Alliance'. In this fanfic, Goku and Vegeta are forced to work together in a situation where their powers are limited. It's interesting to see how they rely on each other's skills and personalities to overcome the challenges, which is quite different from their usual power - based confrontations.
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.
There's a fanfic called 'Goku and Chichi: Eternal Love'. In this, it delves deep into their past, like how they first met and fell in love. It also explores how their love endures through all the battles and challenges Goku faces in the Dragon Ball Z universe. It's really engaging as it combines action and romance elements.
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.
One popular 'Vegeta x Goku' fanfic is 'The Bond Beyond Rivalry'. It explores their complex relationship in a new and interesting way, showing how they gradually come to understand and respect each other on a deeper level.
I'm not sure of a specific 'Goku x Vegeta's sister fanfic' to recommend. You could try searching on popular fanfic websites like Archive of Our Own or FanFiction.net. They have a large collection of Dragon Ball related fanfics and you might be able to find what you're looking for there.
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.
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.
I've heard of 'Love Among the Saiyans' which is also a 'dbz vegeta x bulma love fanfic'. It focuses on how their love overcomes the cultural and power differences between them. It's really interesting to see how Bulma's intelligence and Vegeta's strength complement each other in the story.
One popular dbz goku x gohan fanfiction is 'A Father's Legacy'. It delves into Goku's training of Gohan in a more in - depth and emotional way. The story shows how Goku passes on his Saiyan fighting spirit not just through combat training but also through life lessons.