Man, this feels like hunting for a specific type of mushroom in a vast forest—you gotta know where to look. For MHA OC fics, Archive of Our Own is my absolute cornerstone. The tag system is your best friend; you can filter by 'Original Character(s)', then sort by kudos or bookmarks. I often add 'Midoriya Izuku-Centric' or 'Shinsou Hitoshi-Centric' to see how OCs slot into those dynamics.
But popularity there can be tricky. Sometimes a fantastic 50k-word OC-centric story has way fewer kudos than a fluffy Class 1-A one-shot. Don't just rely on the front page. I've found gems by searching the 'My Hero Academia - All Media Types' fandom tag, then excluding certain character tags to surface OCs. Wattpad has a huge volume, but quality varies wildly—its algorithm pushes what's already trending, so you need patience. Discord servers dedicated to MHA fanfiction often have recommendation channels where members shout out their favorite OC narratives, which is how I found that incredible 'Quirk: Chronostasis' series.
The real secret is that the best OC stories sometimes live in crossovers. Searching 'My Hero Academia & Original Character' on AO3 can pull up those unique fusions with other anime where an OC is the bridge. It's a deeper dig, but totally worth it for something fresh when you're tired of the same tropes.
I get this question a lot when I'm digging through fic recs on a slow Sunday, and from my experience the phrasing 'you are my hero' shows up everywhere — but it’s absolutely most common in the 'My Hero Academia' fandom. That series literally builds its world around the word 'hero', so writers lean into the phrase both as straight dialogue and as a meta hook. I’ve spent rainy afternoons following those threads: it's often in confession scenes, rescue moments, or slow-burn AUs where one character gradually realizes how much another means to them.
Outside of 'My Hero Academia', you'll see it a ton in superhero fandoms like 'Spider-Man' or broader 'Marvel' works because the literal hero/celebrity dynamic lends itself to that line. If you search tags on sites like Archive of Our Own or FanFiction.net for 'hero worship', 'you are my hero', or 'protector', you'll find hurt/comfort and fluff fics where it crops up repeatedly. Pro tip: use quotation marks in AO3 searches to find exact phrases, and sort by kudos or hits if you want the most-read takes.
Honestly, the phrase is so versatile — it works for platonic moments, romantic confessions, and even comedic flips where someone's being dramatic. I tend to click anything with that tag when I'm in the mood for warm, cathartic scenes, and nine times out of ten I end up with a new favorite short fic that’s pure comfort.
The 'royalty' or 'nobility' AU is a historical favorite. Toshinori as a king, Izuku as a hidden prince or a knight, Katsuki as a rival duke's heir. It leans into the fantasy of destiny and legacy that's already present in the series. The 'arranged marriage' sub-trope within this is huge for driving romantic plots, creating tension between duty and personal feeling. It's basically a romance novel template with MHA characters, and it works surprisingly well.