Katsuki’s personality seems almost designed to get messy when gender-flipped, and most AU fics I’ve read really run with that. The aggression and pride are still there, but writers often end up layering in a ton of societal pressure and internalized doubt that the male version doesn’t face. It’s less about making her softer and more about having that same explosive drive constantly hitting a wall of different expectations. You see a lot of 'prove herself twice as hard' angst, especially in rivalry dynamics with Deku. Sometimes it’s heavy-handed, but the good ones use it to show how her canon rage might manifest differently—maybe more coldly calculated, maybe even more volatile because she’s constantly being told to dial it back.
There’s also a weird trend of pairing her with Kirishima that gets super intense in these AUs. With male Bakugo, their friendship is this great bro-dynamic, but when she’s female, it almost always slides into a romantic tension where Kirishima is the 'only one who sees the real her' or some such. It can be sweet, but it also sometimes feels like it undermines her independence, turning the supportive friend into a required emotional crutch. I’ve also seen some interesting takes where a female Bakugo is even more isolated, doubling down on the 'lone wolf' thing because she refuses to be seen as needing protection, which I think fits better.
The portrayal really splits based on the author’s focus. Some use it for pure wish-fulfillment power fantasy—a girl who’s just as loud, abrasive, and powerhouse as the boys, which is refreshing. Others get deep into the angst of sexism in hero society, which can be compelling if it’s not too preachy. My personal pet peeve is when she’s written as secretly insecure about her appearance or secretly nurturing, which feels like a betrayal of the character’s core. The best versions keep that unapologetic, competitive fire intact, just letting it navigate a slightly different world.