My Superhero's Special Power – the power of languages
I would have liked to be fluent at everly language that is, will be or has ever been in the Universe. Being able to speak, understand, read and write every language like a very well educated native speaker would be magnificent.
I have several reasons for wanting this power: Enabling historians to learn more about history, helping people avoiding misunderstandings while translating papers or conversations by making sure the wording in several languages actually means the same, maybe helping solving some of the worlds conflicts by being able to clarify meanings.
And then there is my personal favorite reason: Being able to read literatur from all over the world in the authors native language.