so, basically, it's a bullocks term that means nothing
And, TVtropes holds no pull on me. It's already proven useless to me three times, and it's never really holding of the information I care about.
I see Medaka as someone who was born with power. Whether she wanted it or not is irrelevant. Because she grew up with this. She decided to take a less taken path, and use that power to help others. In all of this, she's cast aside her own ability to be 'human'. But, she does that for the sake of others.
That's just a short (I'm really sleepy) description of Medaka from what I've seen so far. Nowhere does it fit that silly trope.