Besides skeletons and zombies, are there any other undead that figure prominently in LoZ? Do Vampires and Liches exist?
No vampires or liches (or equivalent) have appeared in a LoZ game, so the only undead we have are ReDead, Gibdos, and Stalfos. Twinrova could be a lich in a way (it could be that the twins got the power by draining a great fairy they got more power and couldnt die of age) the same reason you could turn into a lich.