Boku no Hero Academia

[Ryllharu]

No, the limitation is that is she overuses it on an individual, the subject she's trying to save dies instead. If they're hurt too badly, they die anyway. That's a pretty valid limitation. The damage to her is emotional.

In trying to save someone who could truly benefit from her quirk, they burn themselves out healing. She's resulting in their death anyway. With someone who gets frequently hurt like Izuku, she'd actually be killing him, when he would have otherwise survived after a few months in the hospital.

I'm 87% certain you're mistaken about this series. I know this because I was too.

The author has already done some pretty powerful characters well. Izuku, All Might, and Bakugou. One can't handle it yet, and the other has been a fraud for some time. A good-intentioned fraud, but one nonetheless. The last one thought he was hot shit (no pun intended) until the ice guy displayed his powers. Losing to Izuku isn't what just broke Bakogou's pride. It was having years of everyone around him tell him he was super strong, proving it during the entrance exam (#1), but after a thorough struggle against Izuku, Bakugou gets to witness Todoroki (ice guy) achieve victory in seconds. Wounded pride indeed.

I'd say it is safe to say that that author knew how to handle powerful characters and give them actual depth.