Who’s the romantic one:
Makoto is outwardly more romantic, in that he’s more the type to outright say how he feels (no matter how cheesy), or come up with date night ideas for the two of them, et cetera. However, Haru definitely has his moments, such as preparing sweet bento boxes for Makoto or spontaneously bringing home gifts. He’s more subtle about it, but he’s just as romantic at heart.
Who’s the overprotective one:
Haru. They’re both quite protective of each other and Makoto certainly doesn’t like the idea of Haru being in danger (look how he is when Haru ends up in the hospital), but he also tends to be more trusting and less likely to get confrontational on Haru’s behalf. I firmly believe, however, that Haru would absolutely throw down on Makoto’s behalf. He’s very quiet naturally, but I think it’s more like an “oncoming storm” kind of quiet. If you don’t want to get on Haru’s bad side, don’t fuck with Makoto.
Who’s the cuddly one:
Makoto, definitely. He’s certainly the type to pull Haru into spooning, or plant kisses in Haru’s hair, et cetera. Haru, by contrast, isn’t very cuddly at all, and appears quite aloof as a result.
Who’s the jealous one:
Haru, by and large. Makoto tends to be pretty easy going and doesn’t usually perceive others as a threat to his relationship, and even if he did feel jealous, I think he’s more the type to tell himself it isn’t right for him to feel that way, that he should just let Haru go, et cetera. He’s more the type to feel jealousy and then feel guilty about it and turn it into an inward spiral of self-deprecation than he is to act on it.
But we see Haru grow jealous over Makoto multiple times in the series (with Kisumi, and with Makoto’s other friends in the prequel movie), and he definitely gets sulky and petty over it. He doesn’t want to share the bond he has with Makoto, even if he won’t blatantly say so. So he definitely is the one more likely to feel and act on jealousy, for sure.
Who’s the one that is scared of scary movies:
Makoto. Big baby killer whale is super frightened by horror things, as we see in canon. Haru tends to be more bored by them than anything else. They don’t really phase him at all.
Who’s the one full of surprises:
It is incredibly difficult for them to surprise each other given the nigh-telepathy thing they have going on, but Haru is more apt to pull this off than Makoto due to his habit of keeping his thoughts to himself (as best he can, anyway, considering).
Who’s the one that’s better at teasing:
Mmm, it’s about equal! Makoto lets teasing fly more freely, but Haru is probably better at the precision strikes/trolling because he has such a damn good poker face.
Who’s the rough one:
Neither of them are rough in the day to day; Haru values going with the flow too much to get aggressive on the regular, and Makoto is a big, gentle sweetie pie. General roughness isn’t their style.
Sexually speaking, it could be either. Makoto is conscious of his strength (Haru has a swimmer’s physique, but have you seen Makoto? Damn) but he can get caught up in the moment absolutely, and Haru knows what he wants and is unafraid to get it, so. Could be either-or.
Who’s the messy one:
Makoto. Haru more or less lived on his own after his parents had to go away on business and, as a result, learned to keep a nice and clean living space. Makoto, on the other hand, grew up in a relatively normal household and never had to worry about that as much, and therefore tends to be messier.
My rating on the shipping:
10/10 for sure, best ship in the swimming anime.