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.
A goddess of lies and treachery.
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?