TwoSix
"Diegetics", by L. Ron Gygax
Mage-type characters with a single element specialization is a super common fantasy theme, though, not just a superhero concept. I can think of a dozen fantasy series where that's the most common type of mage in the setting. It's weird that D&D's idiosyncratic magical system makes it so difficult to pull off without severely nerfing the character.People trying to port characters with superpowers to D&D, instead of an appropriate superhero game system, is one of my pet peeves. It doesn't work. Stop trying to do it. Or at the very least, put in the work to adapt the character concept to a D&D context. No, you can't be Groot. Or Elsa. Captain America might work in very broad terms, but that shield is a legendary grade item and you don't get to start with it.
Pathfinder's Kineticist class shows that it can be done within the D&D-like paradigm, as well.