Reasons I ship Kyoutani x Yahaba and find their dynamic so compelling:
Starting off with the skin-deep, “obvious” reasons:
1) The classic “bad boy” meets “good boy” trope. From basic aesthetic to exterior personalities to voice (anime-wise), they embody this. Most people thought that these two couldn’t be any more different from each other.
2) …which is then subverted with our realization that the “bad boy” probably isn’t so bad after all and may be more of a softie inside, and that the “good boy” is a freakin’ firecracker on the inside. The latter is what makes this dynamic so compelling for me, tbh. Let’s face it, we know lots of tsundere characters. It’s prevalent in manga/anime, but it’s rarer to find characters, especially background/tertiary characters (at this point in the manga anyway) to have that inner spark that subverts classic generic/good guy expectations without going into yangire territory.
3) Show of hands! Who here wasn’t honestly surprised the first time they read chapter 141 or watched Season 2 episode 23 when this seemingly generic Seijoh benchwarmer, goody-two-shoes-looking kind of guy shoved the freakin’ Mad Dog against the wall and gave him a huge piece of his mind? Who here didn’t suddenly sit straight up and paid attention to that scene? Who here didn’t feel excited or tense or in awe? And for those of you raising your hands, why y'all lying?
Those are my top “superficial, easy to understand reasons from the available manga material we have so far” bracket.
Delving deeper into it though, from reasons 4 to 15 with consideration to future possibilities, plus some extra stuff: