u/Acrobatic_Back_1931

I was listening to the full-cast audio of The Goblet of Fire this morning when I was struck by the thought of who the Fat Lady actually was to warrant not only a portrait at Hogwarts, but also the job of protecting access to the Gryffindor common room.

I think I've settled on the headcannon that she was Godric's wife and she wanted to keep the kids in his house safe, as they felt like hers, too. She seems pretty silly, jovial, and like a good time to have around.

Plus, her portrait could have been feeding him information about who some of the more daring students were when they were regularly returning to common room deep into the night.