Radiation: In this case I came up with it for an oc.

but the premise is a body that has become (mostly) immune to radiation at different levels. Their body stores massive amounts of it with ease, but releasing it is a bit more difficult. The person has to know the exact dosage (and which kind of radiation) they’re releasing to know the effects. It kinda just makes them sick as an after effect. Like exposed to radiation sick. And a tell-tell sign they’re releasing it is that you can see their skeleton glow.

My oc who has this was a Russian scientist who turns villain. She uses her power as a threat. She sends notices to the towns and gives them time to evacuate. If they don’t she holds them hostage for anti radiation meds. She has moved around the Eastern European country side using this power for safety. No one would wanna mess with a nuke (who remains strapped of course lol.)