I've used mindmaps for years--mostly to manage projects at work. I've also used them to plot scenes or to jumpstart an idea for a new novel.
Want to unlock the magnificent creativity of your brain? Get some colored pens, a sheet of white paper, and create a mindmap of your character. This process will free your imagination to go places in your story that you probably wouldn't have thought of otherwise. (I can almost guarantee that.)
Have fun! Mindmapping is playtime with remarkable results. There is no right or wrong way. Only your way.
Explore your genius!