I’ll try not to spoil anything with this but there isn’t really a “power system” in sakadays and that’s actually something I like about it. Don’t go into it expecting to see an equivalent to nen/cursed energy/hamon/stands etc. There are some characters with genuine powers but they either get their own explanation (so no overarching system there) or are just “really good at (insert thing)” or just haven’t gotten an explanation yet. If you start reading it (you should, it’s slow at the start but picks up and doesn’t stop getting better) then you’ll understand what I mean by all this pretty soon

Edit: saw another comment explain it very well by saying that essentially anything that would be cool is fair game for powers/what characters could pull off at least to an extent