Most of the Sua x Mizi stuff I've stumbled across—and I've read a ton of it—tends to orbit a few core ideas. One is the 'forced proximity' setup, which writers love because it's a straightforward engine for tension. Stuck sharing a dorm room during a snowstorm, assigned as lab partners for the whole semester, that sort of thing. It's a classic for a reason; it shoves them together and makes the emotional spillover inevitable.
A less obvious but really satisfying pattern I've noticed is the 'competence kudos' trope. Stories where Mizi is effortlessly brilliant at something and Sua, initially dismissive or rivalrous, is slowly, grudgingly impressed. It flips the expected dynamic and builds respect before romance, which feels more substantial than instant attraction. The quiet moments where Sua observes Mizi excelling and has to internally reconfigure her entire perception of her—that's the good stuff right there.
There's also a weird amount of amnesia AUs? Like, way more than you'd expect for this pairing. One of them gets bonked on the head and forgets their rivalry, leading to a softer, confused version of their relationship that the other has to navigate. It can be hit or miss, but when it's done well, it strips away the defensive layers and forces a kind of raw honesty neither would allow otherwise.