I've since learned that you shouldn't model with subdivisions active, because the mesh will look wrong and not how you wanted, among other things. This model, while using low poly, does use subdivisions when used in Blender.
I've since decided on the style I want to aim for my 3D models, which is one reason why there is an outline on the model, albeit rendered incorrectly (It is supposed to be a black outline). This model represents my mentality. When I get around to making a model that represents my physicality, it will take a form of an overweight felinae.
Yes, I have fixed the weight paint issue that might not be obvious to see at first glance, but when you see it, you cannot unsee it. It's not fixed in this model, but it will be fixed in subsequent models