Stefan

is a Glowing One who was captured, imprisoned and experimented upon by the mad scientist, the Surgeon. He is caged inside the CEO offices of the Red Racer Factory in the Capital Wasteland.

Viewing Stefan while wearing the Ghoul Mask (received via the Tenpenny Tower quest) results in him regarding you without hostility as any other ghoul does. Besides his name, not much else is special about him, except on certain saves where he seems to prefer to squatting in an awkward position over a dead wastelander.