Why are they in .blend format and not something more universal like .fbx or .obj?? I want to use them with Unreal Engine but part of the textures are separate from the actual models so I don't know what exactly to do.
because their purpose is to be used in blender, im pretty sure they could not work in unreal engine without heavy editing with the modifiers and the rig itself.
True, but I'm want more accuracy on looks; Speaking of Unreal, I currently am in the early phases of trying to learn it. If I already knew how it worked, I would've just made my own, but, I don't yet, and it's hard learning.