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AI control both NPC and car

I want to make the NPC do the following tasks: From certain point move to a car and enter the car (with animation), then the car move in a pre-determined path.

I found this tutorial to get some ideas, but it’s for player controller. I’ve followed some AI tutorials on YouTube but most of them focus on character AI.

I mainly have following questions:

  1. How to change the pawn the AI controller posses?
  2. Since I want the NPC to perform continuous behaviors, it’s easy to have a intension to add certain tasks in BT, but the BT will be used for both NPC character and the car and this seems impossible.
  3. What other things should I consider?
  4. Is there any tutorial that might be helpful?
  5. I’ve seen several vehicle AI plug-in in the Unreal market, is there any recommendation that might be suitable for this task?

I’m a beginner for UE4 so please forgive me if I make some silly mistakes or misconception.