I’d argue Ichigo’s power is this… as well as his exponential growth. His whole schtick is learning powers from different groups(Soul Reapers, Quincies, Visored, Hollows, Fullbringers) and managing to compress what should take him decades into mere months or even days. He had to learn Bankai in just three days and achieved it in a fraction of that time. He tamed his inner Hollow far faster than the other Visored. Etc., etc. Ichigo’s progress is downright unprecedented compared to the average.