Straight up, the classic Goku x Vegeta dynamic absolutely dominates the charts, but I'm kinda tired of it being the only thing people talk about. For me, the Chichi pairings from the Dragon Ball era have a different kind of magic. They're grounded, they're about a guy who doesn't even know what marriage is slowly figuring out a family, and there's a sweetness to the fanworks that explore that pre-Saiyan saga life. You get fics that are just... domestic, with Goku trying to understand simple human things, and Chichi navigating being married to a force of nature. It's a niche, for sure, especially compared to the power-level screaming matches with Vegeta, but it feels more real, more about character than universe-saving stakes. The fics that dig into how that relationship even functions after everything he sees and does are quietly some of the best character studies out there.
That said, you can't ignore the crossover phenomenon either. Goku thrown into other worlds creates this fascinating friction. I've seen some incredible 'Naruto' crossovers where his pure-hearted, battle-hungry nature completely disrupts the shinobi world's cynicism and hidden agendas. There's a fun trend of dropping him into 'My Hero Academia' as well, where his definition of 'hero' clashes with the systemic, licensed hero society. These aren't usually romantic pairings in a traditional sense—though I've stumbled upon a few surprisingly tender Goku x Wonder Woman stories that explore a similar 'warrior of pure heart meets ancient warrior' dynamic—but they're popular because they test his character in entirely new frameworks. The appeal isn't just 'who he kisses,' but how his very presence bends the rules of another narrative.