Honestly, the Shouto-centric ship landscape is dominated by a few major ports, but the tides are always shifting. For ages, Tododeku (Shouto/Izuku) felt like the undeniable flagship—it's got the rivalry, the shared trauma, the 'saving each other' dynamic that fuels so much angsty hurt/comfort. It's everywhere, and the fandom output is massive. But recently, I've seen a real surge in Todobaku (Shouto/Katsuki). That explosive, opposites-attract energy, the 'two sides of the same fiery coin' thing, it's catnip for writers who love competitive tension melting into something else.
Then you've got the quieter, more atmospheric docks. Shouto/Shouto, or selfcest, has a dedicated, almost philosophical corner exploring identity and self-acceptance. And you can't ignore the classic Todoroki Family Drama fleet—Endeavor/All Might, or the various sibling pairings, which are less romantic and more for exploring that fractured household. Cross-fandom pairings, especially with other 'ice' or 'fire' users from different series, pop up too, but they're more like special edition voyages.
The interesting thing is how the popularity often mirrors the manga/anime's focus. A major character moment between Shouto and another can cause a shipping spike for months. It's less about which is 'best' and more about which dynamic the community collectively wants to pick apart and reassemble with new emotional wiring at any given time.
My personal dock is a bit of a niche one: Shouto/Tamaki from the Big Three. There's something about their shared social awkwardness and overpowered, visually stunning quirks that creates this quiet, mutually understanding space I really sink into.