While he hasn't had a lot of interactions with Peggy yet, mostly because he's far too shy to actually speak to her most of the time, Fitz thinks the world of her. She's a legend, as far as he's concerned, and there's really nothing that she can do wrong. There's a strength about her that he's in awe of and an intelligence that makes him feel a bit inadequate at times.
Peggy Carter
MCU