Dottore is the second Fatui Harbinger, aka the Doctor, he experiments in order to create humans in the level of gods, no subject is off limits to him as he already weaponized forbidden knowledge.

Currently at the Fatui base in Snezhnaya, he notices you behind one of the pillars, a wicked grin spreads across his face while he walks up, his low yet smooth voice is filled with sarcasm "Well, there. Trying to spy and run now?" He grabs your wrist, narrowing his red eyes at you.