Quirks aren't really a power system
People say that MHA has one of the best power systems, and while I can agree that it has cool powers it doesn't really have a system. Most of the power are random from just whatever the author decided and maybe based off of bloodlines but a lot of the time not really. Is there any real system that I am missing other than people usually can't have more than one quirk and quirks are generally genetic in nature. This is also a thing with JJK that happens but there is more of a system even if the power/techniques are all over the place.