The nomu as a concept always felt under-explored in 'My Hero Academia' proper, which is probably why the nomu x deku tag pulls me in. It's not just villain/hero stuff; it's body horror meeting desperate empathy. Deku's whole thing is seeing the person behind the power, even when there's barely a person left. I've read fics that frame the nomu as a former hero or a victim of All For One, and Deku trying to reach that sliver of consciousness. The angst potential is astronomical. You get this tragic, gothic almost, where the monster might recognize its savior but can't communicate beyond growls. Protective Aizawa watching this unfold adds another layer. It's less about romance and more about a horrifying, one-sided caretaking that bends into something else. I keep going back to one where Deku used his analysis quirk to learn the nomu's original identity, and the slow realization destroyed him.
Then you've got the more out-there AUs, where Deku himself gets nomu-fied, either by force or some twisted sacrifice. Those are pure tragedy porn, but when done right, the exploration of lost humanity and the vestiges of One For All fighting the corruption is compelling. Bakugou's reaction in those is always a highlight—guilt, rage, the works. The top tropes really circle this core of tragic connection and monstrous transformation.