This is Mathius - he was an NPC in the first Dungeons and Dragons game I ever DM'd.
Why he doesn't have a face - I'd say he's a faceless character - except that's not true - he's just faceless because I didn't have the inspiration to draw a proper one.
Anyway Mathius is a early teens boy who is a level 4 warlock, the players met him along the way and he traveled with them.