A template for a specific person. For example, a merchant, a prince, a scientist--anyone who has an important role to play in your world.
Something the character has said.
The voice in Normandy’s head. An ancient Vanari who was part of the Syphus Order.
What is their personality type? Are they funny? Do they have a temper? Are they motivated to protect a loved one? Do they have particular virtues? Bad habits? Any fears or phobias?
What does your character's normal day look like? What do they do? What do they think about?