Quirkless Izuku Midoriya's strength is such a fascinating topic because it really makes you rethink what being a hero means. Without a quirk, he had to rely purely on his intellect, physical training, and sheer determination. Remember how he analyzed heroes and villains alike, jotting down notes in those notebooks? That analytical mind gave him an edge—knowing weaknesses, predicting moves, and adapting on the fly. Plus, his combat skills weren't shabby at all. Even All Might acknowledged his potential before passing 'One For All' to him.
But compared to other heroes with quirks, it's a tough call. Sure, he could hold his own in hand-to-hand combat, but quirks add an entirely different dimension to battles. Take Bakugo’s explosions or Todoroki’s ice and fire—those are game-changers. Izuku’s quirklessness forced him to be more resourceful, but raw power-wise, he’d likely struggle against high-tier villains without 'One For All.' Still, his resilience and strategic thinking make him a formidable fighter in his own right—just in a different way.