I'm definitely not concerned about the length - I've been following One Piece for a long time now, and I'm getting into Jojo's Bizarre Adventure as well, so it shouldn't be too long by comparison to those two!
No problem if you haven't seen much of Dragon Ball - if you know basically any shonen manga/anime main character from the past twenty to thirty years, you've probably got a good idea of what Goku's like (maybe not all of them, but a lot are heavily based on him, like Gon, Luffy, and Naruto).
Coincidentally, I already had a top-level set up here! As for ideas, training seems like a natural fit, or maybe cooking could work. (I don't know about Gon, but Goku would likely be a horrible cook if it doesn't involve cooking something over an open fire - seems like he relies on Chi-Chi for that sort of thing)
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No problem if you haven't seen much of Dragon Ball - if you know basically any shonen manga/anime main character from the past twenty to thirty years, you've probably got a good idea of what Goku's like (maybe not all of them, but a lot are heavily based on him, like Gon, Luffy, and Naruto).
Coincidentally, I already had a top-level set up here! As for ideas, training seems like a natural fit, or maybe cooking could work. (I don't know about Gon, but Goku would likely be a horrible cook if it doesn't involve cooking something over an open fire - seems like he relies on Chi-Chi for that sort of thing)