The addon skins don't sync and it breaks all character voices regardless of skin/character played in public lobbies. Private lobby recommended;
Available by default, no need to be bought;
May cause issues if used and then removed while not having everything else unlocked.
Adds 17 roguelite/team member exclusive generic character appearances as boss skins, as well as a few extra Hielo/Dragon variants (Hielo Rojo with hat, Yielo (no gold, requires DLC), and hatless Yellow Dragon, including character icons).
You may ask, why no Funeral Dragon variant? Because it doesn't have a first person texture and I'm not that good at editing/making them.