I swear I've read half the Ochako x Toga fics on the internet at this point, and the dynamic is so much more interesting than people give it credit for. It's rarely a straightforward romance. A huge theme is 'unbecoming,' for both of them. Ochako is constantly pulled away from her moral high ground, finding her practicality and 'normal' girl persona cracking under Toga's obsessive, all-accepting gaze. And Toga isn't just some manic pixie dream girl; she gets these moments of terrifying clarity about her own brokenness through Ochako's horrified reactions. The best ones explore how Ochako's empathy, her literal superpower, becomes a curse when faced with someone who loves in such a violent, literal way.
You see a lot of 'mutual corruption' arcs, but also quieter 'domesticity amidst chaos' fics. They'll be hiding out in some grimy safehouse, and Toga is trying to make breakfast while Ochako frets about her parents, and it's this bizarre slice of life built on a foundation of kidnapping and attempted murder. The tension between Toga's childish, sincere affection and the horrific things she's done is the engine for most stories. It’s less about fixing each other and more about finding a strange, new normal that exists outside of hero and villain labels. Honestly, I skip the ones where Ochako turns villain too easily; the friction is the whole point.
A niche trope I love is 'blood as intimacy.' It's not just gore. It's Toga offering her own blood, or being dangerously careful not to hurt Ochako too much when she does take it, treating it like a sacred exchange. Ochako's disgust slowly morphing into a twisted understanding is the kind of character exploration I'm here for.