Then you will do exact same thing as if you would attach gun/sword to player
Each part would be additional object
But each part would have multiple animations
So when i change face
Not player or other parts but only FACE part changes animation
Then you can save it to variable and use it in your actual game to change animations
To make it easier for yourself make all your images of some parts as bis as biggest one of them
FOR EXAMPLE
Face parts biggest one will be 10x16
Cause you have there beard
But you have one with only glasses
And that is 8x12
Well you make this as well 10x16
BUT you do not take that into account for other part types
For example that was for FACE
Now you go make body parts and you make all images as big as biggest BODY part you have
Now you do not need to care about points or positions
Cause everything will perfectly align
MAYBE you will just change origin point to center point
And rest is just position them
I would advise NOT going with prefabs cause depending on what you want to do you can find out you can’t
From what i seen ppl struggle to do various things with prefabs and unless you know prefabs will do everything you want its better to avoid them
Like for example trying to use recolorizer extension
Imagine being able to recolor SOME color on some part instead of tinting whole part
Like you made red shirt but i want it blue but it also have white star on chest
If you tint it then star will get tinted blue where you cannot get blue from red you will get purple
With recolorize exension you can give it whatever color you want by replacing red with blue NOT affecting white
As far as i know that would be not possible with prefabs cause you cannot target directly child objects
And now think like instead of having shirts of all color just allowing ppl to color them as they please
Heck think about eyes and hairs
Do something small for 2 characters like ability to change face and pants for example
And after you get it to work you can expand it for other parts and go with recolorizer if you want
Or even effects