From Citizens Wiki
Data storage in Citizens2 is handled in one of two ways: YAML flatfile or a NBT file.
saves.yml is used by default to store all data on created NPCs.
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# Citizens NPC Storage npc: '0': name: My_First_NPC traits: age: age: 0 locked: true spawned: true type: PLAYER owner: Steve lookclose: true location: world: world x: '92.65002360423462' y: '3.0' z: '-264.5621058817138' yaw: '87.90003967285156' pitch: '21.14999008178711' text: talk-close: true random-talker: true 0: Hello, there. I'm My_First_NPC. waypoints: linear: points: '0': location: world: MyWorld x: 60 y: 64 z: 80 pitch: 90 yaw: 0 delay: 0 '1': location: world: MyWorld x: 65 y: 64 z: 82 pitch: 45 yaw: 0 delay: 0 provider: linear