Zora Colakovic, the subject of a "This American Life" story in 2001.
…at the age of 12, she sat down and composed a list of some 30 skills she needed to learn if she wanted to become as close to a superhero as any mortal could be. She even gave herself a deadline– to master these skills by the time she was 23… And the most incredible thing about all of this is that Zora accomplished nearly every item on the list
A transcript is at http://www.thisamericanlife.org/…
It's not completely clear what she's up to right now. Googling suggests she might be a private investigator in California.