Pokémon Masters

[Yami84]

I have this problem where some of the mouths of the characters seem to have their lips glued together, no idea if this is inherent issue with the models or it's a by-product of the current version of Turk's script.

It might or not work but open her mouth before you delete doubles and that should fix it. If It doesn't, add a shape key and open her mouth by using proportional editing, after that set the shapekey into 1 so her mouth is open and delete doubles once more and if that doesn't fix it then i don't know what will lol.

Edit: Just tested it and you can't fix it through opening her mouth using her bones or by using shapekeys. Your only way to fix it is by manually removing the lips doubles one by one, just tested it and it works but it will take you a lot of time doing this method.