If you're hunting for fanfiction where Izuku trains seriously, I'd recommend checking out Archive of Our Own (AO3) first. Their tagging system is a lifesaver—just search for 'Izuku Midoriya' and filter by tags like 'Training' or 'Quirk Analysis' to find gems where he pushes his limits. Some writers really dive into the nitty-gritty of his growth, like 'Deku: The Vigilante' or 'Midoriya Plus Ultra,' where his training arcs feel almost canon-level intense.
Another spot I swear by is FanFiction.net. It’s older but has hidden treasures if you dig deep. Try sorting by favorites or reviews; stories like 'Viridescent' or 'The Dark Below' often pop up with brutal, satisfying training sequences. Tumblr and Wattpad can surprise you too, though quality varies more there. Honestly, half the fun is stumbling onto a random fic that makes you think, 'Damn, this feels like it could’ve been in the manga.'
Let me gush about some of my favorite Izuku training-focused fics! One standout is 'Viridian: The Green Guide,' where Izuku takes a more analytical approach to his training, documenting everything in notebooks like a scientist. The author really nails his obsessive dedication, and the way he experiments with One For All's mechanics feels fresh. The supporting cast's reactions to his intensity are hilarious too—especially All Might's mix of pride and concern.
Another gem is 'Deku? I Think He’s Some Pro…' which flips the script by having Izuku train secretly from the start, leading to rumors about a mysterious quirkless hero. The training sequences are brutal but satisfying, and the payoff when Class 1A realizes his strength is chef’s kiss. Bonus points for rare Aizawa mentorship moments that feel totally in character.
there's this one writer who absolutely nails the grit and gradual growth of his character. Their username is something like 'QuirkedUpWordsmith,' and they have this trilogy where Izuku starts training with Mirko instead of All Might. The fight choreography is insane—you can practically hear the bone cracks and feel the sweat dripping. They balance power scaling so well; Izuku doesn't become OP overnight but earns every bruise.
What sets them apart is how they weave in lesser-known quirks from background characters. Like, in one arc, Izuku studies under a retired hero with a sound-based quirk, which totally reshapes his fighting style. The comments section is always full of martial artists geeking out over the technical details. If you're into realistic progression and fresh mentor dynamics, their work is a goldmine. I reread their latest update three times just for the rooftop sparring scene.
Ohhh, dark Izuku fics where he actually trains seriously? You're speaking my language! There's this one that lives rent-free in my brain—'Blackout' by CrimsonShadows. It starts with Izuku snapping after All Might rejects him, but instead of whining, he goes full vigilante mode. The author nails how his analytical mind would apply to brutal combat training—think 'Batman Begins' but with Quirk analysis notebooks.
What I love is how it avoids edgelord tropes; his darkness feels earned, like when he practices parkour by chasing petty criminals across rooftops. There's even a twisted mentorship with Stain that makes terrifying sense. The fight scenes? Chef's kiss—especially when he dismantles a Yakuza base using nothing but smoke bombs and pre-teen rage. Still waiting for Chapter 27 though... cries in unfinished fic
Izuku's training in fanfiction often feels like watching someone pour every ounce of their soul into becoming stronger. I've read so many takes where he pushes himself beyond human limits—mimicking All Might's regime but dialed up to eleven. Some fics have him doing insane things like carrying boulders up mountains or sparring with pro heroes until he collapses. There's this one story where he secretly trains with Aizawa at night, learning parkour and stealth tactics until his body gives out. It's brutal, but you can't help rooting for him.
Other versions dive into quirk analysis as part of his grind. He obsessively studies heroes' weaknesses, trying to compensate for his lack of power early on. I love when authors blend his strategic mind with physical training—like him using notebooks to plan combat scenarios while running laps. It makes his growth feel earned, not just handed to him. The best fics make you feel every drop of sweat and blood.