Any fics with power copying but not fuel copying?

What I mean is, are there any fics where the protagonist is able to copy the innate superpowers and traits of others?

Like, say they encounter Superman. If they manage to copy any of his powers, they’d have to fuel it with their battery or such, or copy his sunlight absorption and risk being hit with Kryptonite. If they manage to copy Green Lantern’s ring, they could channel and shape the Green Light to make constructs and fly and stuff but they would need a power battery or some equivalent to recharge.

Bonus points if it’s piecemeal power copying, ie they’d have to prioritize if they want Superman’s heat vision or durability or whatnot.