One sentence that makes this NPC memorable.
Appearance
Physical description, distinguishing features, what a stranger notices first.
Personality
*Noticeable traits, speech patterns, mannerisms, behaviors, etc
Alignment
*Their alignment and how it manifests.
Goals
What they want and why.
Background
Origin, history, occupation, where they fit in the world.
Useful Knowledge
What do they know that makes them interesting?
GM Only—Secrets
Every good NPC has a secret. Whether or not its revealed, it should contribute to their character.
Stat Block
Use the stat block templates, if needed.