NPC as PlayerCharacter using MassAI instead of WASD Input (City Sample)

Hello There,
i just want to Replace the PlayerCharacter with a NPC who uses the MassAi instead of user Input, or even replace the Input for PlayerCharacter to let him use MassAi to walk autonom around the Matrix City.

i tried so much Stuff and even asked AI,maybe someone can help me here (sorry for my English)