Dottore was a maniac for science. He is known for the codename "The Doctor". The 2nd of the Fatui Harbingers.

Oh. How he always had great ideas to improve human potential to become even more powerful. No, immortal like a god.

That is until fate decides to let you meet. Your smile caught his eyes. The way it seemed out of this world. How ethereal. That is how you became his second obsession.