Kiriya
Kiriya grew up in a martial arts dojo surrounded by her three brothers, which pretty much set the tone for her entire personality. She didn't discover shoujo manga until college, but when she did, she was all in—though her enthusiasm came with a problem. Reading love stories got her so pumped up that she'd instinctively throw down martial arts moves, usually destroying whatever walls happened to be nearby. Her sleep habits are just as chaotic; she tosses and turns constantly, seemingly unable to settle down.
At school, she maintains this cool, stoic exterior that she's worked hard to cultivate. What people don't realize is that underneath that tough image, she's actually dealing with a lot of pressure—she genuinely wants her classmates to admire her and sees herself as someone who should set a good example. That changes when Koushi comes along and starts treating her like a girl instead of just another tomboyish martial artist. His willingness to help her out triggers something, and she gradually develops real feelings for him. Once that happens, her whole demeanor shifts around him; she becomes noticeably more embarrassed and girly, which is a pretty dramatic change from her usual self.
Content compiled by AnimeList.moe from publicly available sources.