Mercy: Frankly, Mercy knows Magneto was a doctor. However, she just... doesn't care about that. One of her bffs is a doctor and a werewolf. So, she has different standards.

She only cares that Magneto helped her with the garage. She only cares that Magneto comes over and enjoys the simple pleasure of taking something that doesn't work and making it work.

Other than that? She's really quite neutral on him. She's not involved in most of his drama, so... yeah.