Claire makes the most sense as the superhero for two major reasons...Honestly, she could be anyone. I only thought of Aunt Emma because she wears that exact same shade of red fingernail polish. But then, Faerin was talking about doing a date night with Claire this next update if he had the time for it.
One she brings it up during dinner and two she works at at the high tech company that would create such a superhero!
Now there are only three women we have seen who work there so if it isn't Claire it is more likely one of those two.