If there's one thing I've learned from reading a bunch of these, it's that they wildly overestimate Goku's emotional intelligence. Half the time, they just stick to his canon personality, making him hilariously oblivious to the romantic tension swirling around him. It's a mess, but that's part of the appeal? The dynamics are less about deep relationship building and more about the chaotic, 'how did we even get here' energy of a bunch of powerful characters trying to get through to one emotionally stunted guy.
Some authors try to 'fix' him, giving him sudden romantic awareness that feels super OOC. Those stories tend to focus on Goku as this ultra-protective, hyper-competent partner, which honestly loses the charm of the original character for me. The best ones lean into the absurdity, letting the harem members play off each other—Bulma scheming, Chi-Chi exasperated, maybe someone like Android 18 just there for the free food and fights, with Launch providing accidental chaos. It's a delicate balance between making Goku still feel like Goku and giving the women reasons to stick around that aren't totally insulting.
I skim a lot of them, honestly. The character dynamics often feel like a checklist rather than a story: each love interest gets a designated 'trait' (the smart one, the fierce one, the gentle one) and they take turns interacting with Goku without much interplay between themselves. I'm much more interested in fics where the women actually talk to each other, form alliances, or get fed up and bond over his denseness. Those are rarer, but they're the ones I'll actually follow.