Best options for an absolute beginner?

This isn't for me, but a friend of mine. She's been struggling recently in Rivals and is new to the Hero Shooter genre in its entirety. She's been struggling to get any kills across most characters she's tried. So far she's used: Captain America (currently her favorite) Mr. Fantastic Winter soldier Obviously she needs to overcome the basic skill issue of being new but I'm curious if anyone knows any good characters that work universally for new players. She likes front line heroes with simple kits and minimum complexity.