The main characters are bound to be Bardock and Gohan. Bardock with his fierce Saiyan warrior past and Gohan, who has his own unique blend of Saiyan and human qualities. There might also be other supporting characters like Piccolo who could pop in to add some more depth to the story, or perhaps even Bulma if she has some role to play in the time - travel or dimension - hopping aspect of the story.
Well, it could be about Bardock somehow traveling through time to meet Gohan. Maybe Bardock wants to see the potential of his future grandson's power and they end up training together for a bit.
A powerful dark wizard or sorcerer could be the antagonist. He might be after the Saiyan's life - force or some special energy that Gohan and Bardock possess. This wizard could use dark magic to create all sorts of obstacles for them, like illusions, cursed landscapes, and powerful minions.
In the fanfiction, their relationship could start with distrust. Bardock might not trust Gohan because he is part human. However, as they face challenges together, like fighting off some common enemy, they start to understand each other. Gohan could show Bardock his unique fighting style which combines both Saiyan and human techniques. Bardock, in turn, could pass on his knowledge of Saiyan heritage and the importance of Saiyan pride. This would gradually strengthen their bond.
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.
Obviously, Naruto and Jiraiya are the main characters. They are the focus of the 'naruto meets jiraiya' concept. Naruto, the energetic and determined ninja, and Jiraiya, the wise and powerful mentor.
Obviously, Hermione is one of the main characters. And from the Volturi side, Aro, Caius, and Marcus are likely to be important. They are the leaders of the Volturi and would surely be involved in any encounter with Hermione.
Well, obviously Naruto himself would be the main character. There could also be his friends like Sasuke and Sakura, who might be involved in the interactions between the two Narutos. Maybe they are confused at first by seeing two Narutos, but then they help them figure out what's going on.
In this fanfiction, it could start with Gohan exploring an ancient Saiyan relic. Unbeknownst to him, this relic has the ability to bring back the spirit of Bardock. Once Bardock appears, he is initially confused about where he is and who Gohan is. Gohan, being the kind - hearted person he is, explains the situation. As time passes, Bardock starts to train Gohan, pushing him to new limits. Gohan also shares his knowledge of Earth's culture and values with Bardock, which makes Bardock see a different side of life compared to the brutal Saiyan culture he knew. This interaction could change both of their perspectives and lead to a new understanding between the past and present of the Saiyan race.
In the 'Gohan meets Bardock' fanfiction, it might start with Gohan stumbling upon an ancient Saiyan relic that somehow connects him to Bardock. Bardock then appears as a spirit or through some time - traveling magic. They have a deep conversation about the purpose of the Saiyan race. Bardock could be proud of Gohan for breaking the mold of the typical Saiyan, being more about protecting the innocent rather than just fighting for power. Gohan, in turn, could be inspired by Bardock's raw Saiyan spirit and find a new way to combine it with his own values.
The main characters are obviously Kid Goku and Bardock. Kid Goku is the young and innocent version of the powerful Saiyan we all know. He's full of energy and has a pure heart. Bardock, on the other hand, is a strong and battle - hardened Saiyan. He has a more serious and warrior - like demeanor compared to Kid Goku.