Man, this question hits right in my sweet spot. I've read way too many of these. The core of godlike Izuku fics isn't just about him being strong from day one—it's about the narrative having to evolve around that power. The classic 'One For All' power scaling is completely shattered, so authors invent new ceilings. Maybe it's about mastering the philosophical weight of being a living natural disaster, or the power itself mutating into something weirder, like reality-warping or conceptual stuff beyond smashing buildings.
Often, the evolution becomes external. Since Izuku can't really 'level up' in a traditional sense, the focus shifts to how the world reacts. Hero society might splinter into factions trying to control or worship him, villains get desperate and pull out ancient magic or alien tech to counter him, and the other characters have to find new roles. I've seen fics where Bakugou's entire arc is about weaponizing support gear to be relevant, which is a fascinating twist on their dynamic. The power stops being a personal tool and becomes a geopolitical event that forces everyone else to evolve.
The best ones I've read use that overwhelming strength as a lens to dissect the original story's themes. What does 'saving people' mean when you can stop any disaster instantly? The heroism becomes less about the act and more about the intention, the restraint, the emotional intelligence needed not to break the world by accident. That's where you see real character growth, buried under all the continent-shattering feats.