Fictional characters with nuclear abilities

Must be a defining trait - Characters with access to vast powers (i.e. magical spells, advanced technology, genetic engineering, etc.) who are theoretically capable of this superhuman feature or ability - but whom have neither made regular use, nor provided a notable example, of this extraordinary or supernatural feat - are not listed here.

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These are listing of fictional characters that have nuclear capabilities related to energy or radiation. This includes the ability to control the kinetic energy of atoms to generate, control, absorb, or metabolize atomic energy into greater physical attributes.

For characters whose origin involves nuclear power, but whose actual super-powers do not (such as Spider-Man), see Category:Marvel Comics mutates