"What you are?" His face has been difficult to read up to this point, yes, but now a bit of confusion does cross his features. Lucas blinks. "I mean...I guess? Seems like you're a kid."

This is stated as if it's evident--which it is, as far as Lucas can tell. Chara looks like a perfectly normal kid to him, and he's honestly not really sure what they'd mean otherwise.

But more words follow, and it's Lucas's turn to tilt his head slightly, considering them with a very small frown. "I don't want to attack you." It's sincere; he'd given his word that he'd do his best not to.

Though...he does have a lot of questions of his own, that's true. But clearly Chara doesn't feel like fielding many of those right now; and so, after a moment's thought, Lucas ventures some sort of compromise. "I do have a few questions. But I think you're pretty new to this place, right? Do you still have any questions of your own? Could try to answer those, too...I've been here a little while now."