If you're seeking out stories where Izuku endures hardship but finds a light at the end of the tunnel, that particular emotional arc is well-represented across several fanfiction hubs. The Archive of Our Own, or AO3, is incredibly well-suited for this specific need due to its granular tagging system. You can combine tags like 'Midoriya Izuku Has Issues', 'Angst with a Happy Ending', and 'Hurt/Comfort' to filter directly to those narratives. The 'Hopeful Ending' tag itself is also used fairly often. I often find that writers on AO3 are particularly skilled at stretching out that emotional low point, making the eventual recovery feel earned and genuinely uplifting, rather than a rushed fix.
FanFiction.net still hosts a massive archive of 'My Hero Academia' stories, though its search function is less precise. Browsing the 'Angst' category within the fandom and sorting by favorites or reviews can surface classics that fit your request. Titles often hint at this journey—look for phrases like 'Through the Dark' or 'Bruises Fade'. Tumblr also remains a vibrant space for shorter, poignant pieces and fic recommendations; searching 'whump' or 'hurt/comfort' alongside Izuku's name can lead to threads full of curated links and writer blogs dedicated to that flavor of story.
What makes this specific combination so engaging, at least in my view, is how it mirrors the core of Izuku's canon character—his resilience. Reading about him being pushed to an emotional brink, whether through quirklessness, betrayal, or failure, only to slowly rebuild and find hope again, reinforces that foundational trait in new and often deeply moving ways. The 'sad' part isn't just misery for its own sake; it's the soil from which the 'hopeful' ending grows. You'll likely find that many of these stories focus intensely on his relationships, like a strained-but-healing dynamic with Bakugo or a protective one with All Might, using those bonds as the anchor for his recovery. The final scenes in the best ones rarely declare everything perfect, but they leave him, and you, with a sense of forward motion, maybe watching a sunrise or taking a first steadying breath after a long cry.