Another plotline might involve Bardock's spirit or some sort of time - distorted encounter. Goten could be in a battle or a difficult situation and receive guidance from Bardock's spirit. This could lead to Goten unlocking new powers or a new understanding of his Saiyan roots as he has this unique interaction with his long - lost ancestor.
I'm not sure of specific 'goten meets bardock fanfiction' titles off the top of my head. But you could also check out Dragon Ball fan communities on social media platforms like Reddit or Discord. Members there often share and discuss their favorite fanfictions, which could lead you to some good ones about Goten meeting Bardock.
For Goku, he could gain a deeper understanding of his heritage. Meeting Bardock would make him more aware of his Saiyan side. He might become more confident in his Saiyan abilities. For Bardock, seeing Goku all grown up and powerful could give him a sense of peace. He could realize that his sacrifice was worth it and be proud of the man his son has become.
One possible interaction is that Bardock could spar with Goku and Gohan. He'd test their limits and see how much they've learned about fighting. Another could be Bardock sharing stories of Planet Vegeta with them, which would be really interesting for Goku and Gohan to hear.
Goku could develop a deeper sense of his Saiyan identity. Knowing his father, he might start to embrace more of the Saiyan warrior spirit. Bardock might change too, seeing the good in the universe through Goku's eyes.
There could also be a plotline where there is some sort of danger threatening the Pride Lands. Kovu and Mufasa, despite their differences, team up to face this threat. Kovu brings his unique skills and knowledge from his pride, and Mufasa uses his wisdom and leadership. As they work together, they develop a mutual respect for each other that was not there before.
Maybe Talion could help Frodo on his journey to destroy the One Ring. He has his own combat skills, so he could offer protection against the various threats that Frodo faces.
One possible plotline could be a competition between Naruto and Sebastian. For example, a contest of skills where Naruto shows off his ninja moves and Sebastian displays his butler feats.
A possible plotline could be that Yugito is kidnapped by an enemy organization. Naruto hears about it and decides to rescue her. Along the way, he discovers more about Yugito's past and the importance of the Two - Tails to the Hidden Cloud. Another plotline might be that they both enter a mysterious ninja tournament. There, they have to fight side by side against powerful opponents and learn to trust each other's skills.
One possible plotline could be that the oc is a powerful enemy who initially challenges Sasuke. But as they face other threats together, they gradually become reluctant allies. Another could be that the oc is a healer who tries to cure Sasuke of some internal injury or curse mark problem. Or perhaps the oc is a time - traveler who has come to change Sasuke's fate, which would lead to a very complex and interesting story.
One possible plotline could be that Dante is on a mission in a world that has some connection to Naruto's universe. There, he encounters Kurama. They start off as cautious of each other but then realize they can help each other. For example, Dante could need Kurama's knowledge of the local demonic forces, and Kurama could be interested in Dante's unique weapons.