Nothing too special except you need to make sure stuff that should move together has the same vertex weights.
Btw.. I guess you mean skinning instead of rigging but if you want to build a rig then I don't know of anything that would work differently for modular characters.
So Is not necessary to weld the vertexs of every part for the skinning, I only have to combine the different parts, and I could copy and paste the weights to save time.
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Btw.. I guess you mean skinning instead of rigging but if you want to build a rig then I don't know of anything that would work differently for modular characters.