In Mastering the Process: From Idea to Novel, Elizabeth George offers a prompt sheet that she uses to help her develop characters. The prompt sheet is a prompt, not a form; it should be used to prompt stream-of-consciousness freewriting about the character being considered. It's not intended as a rigid set of requirements.
• Name • Age • Height • Weight/build • Birthplace • Color hair/eyes • Physical peculiarities or unique details • Educational background • Best friend • Enemies • Family • Core need • Pathological maneuver • Ambition in life • Gestures while talking • Gait • Strongest character trait • Laughs at or jeers at • Life philosophy • Political leaning • Hobbies • What other characters first notice about him/her • What the character does alone • One-line characterization • Will reader like or dislike the character? • Does the character change in the story? How? • Significant event that molded the character • Significant event that illustrates who the character is now
George, Elizabeth. _Mastering the Process: From Idea to Novel. Viking, 2020.