1: [Name] is [high concept]. He/she has [background]. He/she has [ideal] but is hampered by [flaw]. He/she is [short-term goal], in order to [long-term goal].
2: [Name] has [sensory cues]. When met, he/she is [behavioural cues].
For example:
Count Strahd von Zarovich
"I am the ancient. My beginnings are lost in the darkness of the past. I am not dead. Nor am I alive. I am undead, forever."
Count Strahd von Zarovich is the scheming vampire overlord of the cursed barony of Barovia. Centuries ago, the mortal Strahd made a pact with darkness to reclaim his youth and win the heart of the beautiful Tatyana: an act that ended in tragedy. Strahd longs for power, but is cursed to endlessly replay the events that led to his immortality - falling madly in love with the reincarnated forms of his lost love Tatyana. Strahd is currently luring adventurers into his realm so he can murder them and steal their identities, extending his malign influence far beyond Barovia.
Strahd is tall and lean, dressed in courtly black silk, with a pale gaunt face and eyes like two bottomless pools of darkness. In person he is darkly courteous with guests, cruelly mocking to victims, and flies into a bestial rage if his evil plans are foiled.