It's kind of funny, because a lot of character analysis focuses on his power or his look, but when I'm reading those fics, I'm actually there for the specific push-pull of his personality. Chuuya's got this aggressive, abrasive exterior, all shouted curses and quick fists, but the lore dives deep into his loyalty and his oddly traditional sense of honor. That gap is the whole playground.
You get to see this rough guy being awkwardly, fiercely protective. He'd probably grumble about you getting caught in the rain but throw his coat at you anyway. Or he'd challenge someone who disrespected you to a duel, then act like it was nothing. The engagement comes from poking at that soft core he tries to hide under all the bravado. It's not just about him being cool; it's about being one of the very few people allowed to see past the 'King of the Sheep' act to the guy who values his people above everything.
Plus, his backstory is a tragedy wrapped in gravitas. Writing a reader who understands that weight, who sees the burden he carries without him having to say it, creates this immediate, intense intimacy. It feels earned, not just assigned.
Anyway, that's why I keep clicking on them. It's that specific blend of protective hostility and hidden vulnerability that just works.