Perhaps a fanfiction where Vados senses a new threat approaching the universe. She enlists Goku to help her find a way to stop it. Along the way, they encounter strange new races and powers. Goku's simple but powerful approach to fighting combined with Vados' wisdom would make for an interesting dynamic as they search for a solution to this impending doom.
A fanfiction could involve Vados taking Goku on a journey through different timelines to show him the consequences of his actions. Goku would see alternate versions of himself and his friends. This experience could make him more cautious and strategic in his battles back in his own timeline. Vados would be like a guide, teaching Goku about the importance of balance and how his power affects the multiverse.
Friendship is also a common theme. Despite coming from different worlds, Naruto and Vados in these fanfics usually form some kind of bond. They learn from each other and support one another through various challenges, whether it's fighting a common enemy or just understanding each other's cultures.
One interesting concept could be the power dynamics. Since Black Goku is a powerful and often malevolent version of Goku, exploring how their powers interact in a fanfiction can be exciting. For example, they might have an epic battle where their similar yet different fighting styles clash.
Character development is also crucial. In many such fanfictions, Female Goku Black may start as a villainous or at least antagonistic character. But as the story unfolds, she might change due to her interactions with Goku. This transformation can be really interesting to follow. For example, she could start to question her own motives or even develop feelings for Goku, which is a big shift from her initial stance.
There's a fanfic called 'The Meeting of Naruto and Vados'. This one delves into how Naruto, with his ninja skills, and Vados, with her angelic abilities, interact. It's really interesting as it shows Naruto being in awe of Vados' power at first and then gradually learning from her. They end up having a great friendship and going on various adventures together.
As the story progresses, some fanfictions might explore a begrudging respect. Despite their differences, they recognize each other's power and fighting abilities. For example, they could have a series of battles where they start to understand each other's strategies better.
One idea could be that Goku and Goku Black are forced to team up against an even greater threat from another universe. They start to understand each other's fighting styles during the battle and gradually develop a grudging respect for one another.
Well, Goku Black could be the more dominant character. His dark nature gives him a different kind of power. He doesn't have the same moral constraints as Goku. This could allow him to make more ruthless and effective decisions in battle. He might be able to outmaneuver Goku if he plays his cards right.
Issei would be very likely. Since Issei is the main character in DxD, his curiosity and his own pursuit of power would make him interested in Goku. They could train together and learn from each other's abilities. Also, Rias would interact with Goku. As a powerful devil, she would be intrigued by Goku's power and his different way of approaching battles.