hollow

this power is obviously inspired from hollow knight.

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the user will be hollow/void on the inside, it will allow the user to store anything inside his body infinitely by absorbing it from skin contact, the user can store living things but they will suffocate by lack of oxygen.

by being hollow the user doesn't get hurt through conventional means, the user skin/outer body is the only thing keeping the void, the void is like blood to the user, if he losses too much he will die, by getting cut the void will seep through the cut, by getting decapitated the void will leak out of the throat.

when a part of the users body gets cut it looks black on the inside and has darkness leaking out, the user can attach the part that got decapitated back. (like buggy)

after sometime of the void leaking like blood it will make the user dizzy and feel weak, and eventually die of void loss

the body of the user can also contain infinite amount of energy (chakra/haki/stamina) because the body regenerates that energy and the body has infinite space to store it. (doesn't mean the user can use it all at once)

the user cannot control the void, hollowness is a passive power (in its regular state, in one piece and mha there is awakenings soooo)

--------------------------------------------------------------------------------------------------------------tell me what you think, is it too OP to have infinite energy? probably but at least the energy comes from somewhere, you could basically be an energy bank that keeps growing everyday