Hi,
The retopology add on would probably fix this for me, but I'm hardly ever dealing with character meshes, just landscape. So I'm probably not qualified to answer. I'd probably check the normals, to see if they're all outward facing. As of this post, I do not know of an automatic normal aligning tool in existance. It doesn't seem that hard to make to be honest, but nobody has yet unfortunately. A simple "this, or these selection of faces are 'outside'". My factors for choosing them to be outside are the following; Perpendicular to the Sun, Lighting, HDRi... please fix my normals. But nothing, Radio silence. I've tried loads of scripts, for the last twenty years, not one have them have been sucessful in properly flipping normals. All of the normals, all of the time 100% sucess rate. AI should be doing it. There is no reason why AI can't do it.
So to summise, I'd say it's flipped normals, in my limited knowledge of character modeling.
Regards,
Darawork
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