Amazing pack of various things! Really great job man.
I might be stupid, as I don't have much experience with 2D art, but when I try to slice it in the sprite editor in Unity, there is multiple sprites that doesn't get sliced, because some of them have pixels connecting to eachother.
For instance the facing up idle on premade_character_03_0 has hair connecting in every single one, so it's not possible to slice without alternating it yourself.
This is not criticism, just a note. Absolutely love your work.
Much love.
Edit: I've seen more people having this issue, with various solutions now.