Sephiroth turns to look when he's called. Also very human (although technically a human-alien hybrid due to being injected with alien DNA), but with very long hair, silver despite his young age. His wing is hidden for the moment.

"Yes, I am," he says, starting over. "I arrived here several weeks ago. I've just been exploring everything on the Isle, familiarizing myself with where places are. This is the first time I've seen someone in here."

Maybe he just tends to come at times when people aren't around.