I've added a new feature to the character Edit forms. You can now include arbitrary notes to plot. These can be whatever you like, such as your character's backstory, personality, motivations, goals, etc. The information you include here will only be visible to plot members, so feel free to include anything that might help them craft a more satisfying story for you.
Plot folks, you can access a character's plot notes from the Plot Notes button on their character sheet. Don't worry if you don't see the button there; that just means there aren't any notes to view. And players, don't worry if you can see this button on your own character sheets; you're supposed to be able to.