She was the babe of Shield. Not like, the Bay Watch people or a Barbie, but a baby. Sage Rosalie Fury, an adopted daughter of the director. Unlike her adopted father, she was not serious at all. Sage was only serious when she was working on a project. Sage always joked, and disregarded most rules, claiming them irrelevant to her standard.
She missed the Avengers first appearance when they saved the world, and she doesn't plan on not going to the benefit ball, where they all are.