He smells pretty human, and all around it's nearly impossible to tell that he wasn't without a magical sense of some kind. The Seventh fonon was remarkable at its ability to mimic things.

To answer her question, he draws a small knife from his belt, and lightly runs it across the palm of his hand. Gale squawks her displeasure of seeing Sync hurt himself, making him hush her softly. It bleeds only a little, but after a moment, the blood suddenly begins to glow softly and dissolves into a small magic cloud that disperses on the wind. "On Auldrant, humans are made of flesh and blood, along with various elemental energies. Unlike them, I'm only made of one kind that's entirely mimicking everything else, the flesh and blood included," Sync explains, putting the knife away.