So my friend made a npc that looks like this when built:
But then if I import it to the project and move it, it just breaks and became this:

Here is the object in the workspace:

Other npc works fine when moving, is it because of the body parts being meshes here? I tried figuring out the motor6d and stuff, but it doesn’t solve the problem.
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So the problem can be a lot of things because you didn’t really give us anything to work with. From the image it could m ean unanchored, motor6D is the wrong way around, etc. Provide more detail please!
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every body part’s property is the same, and also heres the motor6d for humanoidrootpart
Try making all the Motor6 Part 0 to Part 1 and Part 1 to Part 0
Edit: Lets take it step by step to resolve it
wait I thought the entire model has the skin and everything, is it just the colored parts?
It looked like this before

Now after adding motor6ds, changing them, messing around a bit, it looked like that above
edit: Animations don’t even play in this rig even at the very first
Are the example head / gray arms part of the stuff or not?
I think it is because the body parts cannot be meshes?
No meshes work. You just have to figure out a few things have you tried doing joints yourself with a few plugins?
Nope, my friend gave me this model
2 things,
1: What use are you going to use this for?
2: send me a rbml file and I’ll try and figure out your problem.
Yea save it as a file and try send it to me in here.
I can only export is as an object though
edit: I’ll send you a roblox studio project with the model
Alrighty, I’ll check it out. Thanks
I found problem, most of the stuff should be welded to their parent and I’ll do that for you with joints.
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FixedNPC.rbxm (25.5 KB)
Here is your fixed NPC. Just add the BillBoardGui again. 
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Oh wow it works! Tysm you helped me a ton!!!