Ah! Well, this is one of those places where statistics answer a question possibly different than the one asked. You almost need to skim off the juggernauts (which are for many Reasons going to lean White Men either representationally or characterwise) to see what else is going on.

W00T on your Book!

Peggy is operating in that valley of Research Needed, Source Misuse and Thankless Job. Which is to say one has to be Ginger Rogers to write her. ;) Unless one gives her a cameo, which I did because I had Issues with how the Russos managed her in The Winter Soldier and source has only escalated since then.