Can I get help fixing shaders for a downloaded model?

I downloaded a model provided by Rip Van Winkle at (It’s SFW if you want to check it out). However, the first thing I noticed is that the eyes are completely invisible in EVEE. Changing the blend mode to alpha blend didn’t help. The only thing I could figure out to fix the problem was to disconnect the alpha input and just set it to 1. It would be nice if I could use the alpha map, so if anybody knows what I’m doing wrong, please let me know.

Also, his hair is just completely messed up. The bulk of it is pitch black and the highlights are completely white. It’s divided into three separate objects and I can’t even figure out what the model’s creator was even trying to do with it, let alone how to fix it. Thanks to anybody who can help.