It could lead to an incredibly powerful character with a mix of Buu's elasticity and Gohan's potential. Maybe they'd have new abilities and face even greater challenges.
I found a fanfiction that focuses on Female Majin Buu's growth as a character with Gohan as her mentor. It's interesting because it delves into how she adapts to life on Earth with Gohan's guidance. The story also has some really cool action scenes where Gohan and Female Majin Buu train together and then use their combined skills to take on villains.
A common theme is the power dynamic. Gohan is a powerful Saiyan, but Female Majin Buu has her own unique abilities. Their relationship often explores how they balance and combine their powers. Another theme is friendship. They come from very different backgrounds, so the fanfictions usually show how they overcome those differences to become friends.
In a fanfiction, their relationship development could be quite complex. Female Majin Buu's more carefree and unpredictable nature could initially clash with Gohan's more disciplined self. However, as they face various challenges together, such as a powerful enemy attacking the planet. They start to understand each other better. Gohan begins to appreciate Female Majin Buu's unique perspective and abilities, and she respects his intelligence and strength. This mutual understanding paves the way for a closer relationship, whether it's a strong friendship or a romantic relationship depending on the direction of the story.
A possible plot is that Female Majin Buu, who has a different view of the world compared to Gohan, tries to show Gohan how to have more fun and be less serious all the time. This could lead to some comical situations as Gohan is used to being more reserved. Or perhaps there is a situation where an evil force tries to turn Female Majin Buu against Gohan, but their friendship overcomes the mind - control attempts.
Gohan has the advantage of his Saiyan heritage which gives him natural fighting abilities and the ability to increase his power rapidly. But Naruto has trained hard all his life and has the ability to tap into the power of the Nine - Tails. In a fight, if it was in an open area, Gohan might be able to use his flight and long - range energy attacks to his advantage. But if they were in a more enclosed space, Naruto could use his ninja skills like stealth and close - combat jutsu. Also, Naruto has his Sage Mode which gives him enhanced senses and strength. So, it really depends on the circumstances of the fight.
In the fanfic, Bardock might be filled with pride. He could be thinking how his son has grown into such a powerful warrior. After all, Goku has come a long way from being a little Saiyan baby sent to Earth. Watching Goku fight Buu, Bardock might see all the potential he always knew Goku had, finally being fully unleashed.
In the fanfiction, Bardock might be in a state of awe. Goku's fight against Buu is no small feat. Bardock would likely note Goku's ability to keep getting back up, no matter how hard Buu hits him. He might also be thinking about the power levels involved. In his time, the power levels he knew were much lower. Now, seeing Goku take on a foe as powerful as Buu, he'd realize just how much the Saiyan race has evolved, especially with Goku as a prime example.
It could potentially influence Goku's fighting style. Bardock was a fierce warrior with his own set of techniques. Goku may subconsciously incorporate some of Bardock's fighting spirit or even mimic some of his moves. Also, Bardock's presence could be a source of inspiration for Goku, making him come up with new strategies on the fly during the fight against Buu in the fanfic.