There's a great deal that's intriguing about what Charles is saying, and his word choice. He assumes that evolved, here, means something biological, a divergence from humanity instead of an overwriting, as he'd recently attempted.

"Yes," he answers after some consideration. "Though I'm not sure what."

It hasn't occurred to him that someone might be able to detect his power in this place, and without ever needing to temper or hide it, Viktor wonders if he hasn't made a mistake. Still, Charles seems more curious than anything, and not afraid. That much is probably important.

"A mage, of sorts. But the first of my kind."

Someone who has achieved his power through technological means--as the Doctor said, the apex form of Hextech.