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.
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.
If Bardock arrives on Namek in the fanfic, it could also change the fate of the Dragon Balls. Instead of being just a tool for Frieza or the Z - fighters to use, Bardock could have a different vision for them. He might see them as a way to not only save Namek but also to restore the Saiyan race. This would open up a whole new set of plotlines and possibilities, as his motives would be different from the other characters who have interacted with the Dragon Balls in the original story.
Goku's storyline would be affected in several ways. For one, without Vegeta, Goku might not have the same intense rival that pushed him to become stronger. Also, the Saiyan lore that Vegeta could have passed on to Goku would be lost. This could change Goku's understanding of his heritage and his place in the universe.
Bardock's presence would likely add a new level of intensity. His Saiyan warrior spirit would inspire the other Universe 7 members. He might be more aggressive in his fighting style compared to some of the others, which could either lead to quick victories or put him in risky situations.
It often puts him in great danger. Hydra is a powerful and ruthless organization, so Peter has to be constantly on guard.
It could boost his confidence. Knowing that the Weasleys are there watching him, Harry might feel more determined to do well.
His refusal might force the story to develop in non - violent ways. New solutions have to be found to resolve the problems without fighting. This could involve things like political intrigue, diplomatic negotiations, or uncovering secrets. For instance, instead of fighting a villain directly, Harry may start to dig into the villain's past to find a way to neutralize them without combat. Also, it can change the power dynamics in the story. If Harry was supposed to be a key fighter, his refusal could make other characters step up or new alliances form to compensate for his lack of fighting.
A fanfic could explore their relationship through flashbacks. For example, Bardock could have left some sort of message or power for Goku that he discovers later. This would create an emotional connection between them even though they never really met in the original story.
Yes, Goku does meet Bardock in the manga.