Although I think this is pretty much a silly question, I would take it as asking what kind of creature could we imagine finding (I presume in the fossil record?) that would falsify the ToE.
If it was from here there would have to be a fit into Evolution somewhere, somehow. There is just no escaping this.
Your statement seems to indicate that there is no creature we could ever find that would falsify the ToE. "It would have to fit somehow." I would have to disagree. Maybe we would not jump right to the conclusion that the ToE was false, but it would give us pause to question our understanding and the workings of the theory in general.
But we could not discard the TOE on the strength of one griffin.
I do agree with this statement. We do expect anomalies from time to time. That is just how the world works, our understanding is incomplete. There is however, a line - where an anomaly is so far out of place - that if crossed, should cause us to question our present theory. That's how science works, the theory is NOT infallible.
So ... all you YECs out there ... get out there and find us a griffin!! Or a minotaur - that would be cool too!!
HBD
Whoever calls me ignorant shares my own opinion. Sorrowfully and tacitly I recognize my ignorance, when I consider how much I lack of what my mind in its craving for knowledge is sighing for. But until the end of the present exile has come and terminated this our imperfection by which "we know in part," I console myself with the consideration that this belongs to our common nature. - Francesco Petrarca
"Nothing is easier than to persuade people who want to be persuaded and already believe." - another Petrarca gem.