The Truth
It's a secret he's kept from everyone – from his family, and even his friends. He knows it's the truth, has known it from the first time he got a paper cut after the accident.
No one else will know. Not for years to come, he thinks, when there will be no hiding it. When Tucker hits his growth spurt, and Sam's body begins to change to that of a woman, when his parents will begin to wonder if Danny will ever come into his own. Even then, he thinks he might be able to hide it, if he can only figure out the secret to changing his own form.
Danny Fenton is not a halfa.
He is a full ghost.
He can hide under the guise of humanity, simulate a beating heart, reduce his ectoplasmic signature to one that will slip under the radar of most ghost shields.
But Danny Fenton always bleeds green.
Fin
I don't know that this fits accurately into the continuity of the series, but it was still fun to write. I'd love to see a story where Danny really is a full ghost trying to fit in with humans, so to speak – although I don't know how different it would be from the original story …