The invisible man. Claude rains was the perfect choice for that role, refined but sinister voice. Seriously there wasn’t any actor at that time who could have done a better job (I’m simping, I know)

Classic or modern?

Classic? Hunchback of Notre Dame.

Modern? Brendan Fraser Mummy.

https://en.m.wikipedia.org/wiki/Universal_Monsters

Invisible Man if that counts. Werewolf up there too