A wizard like ganondorf and he transformed in too ganon
Wait, this thread is almost 3 years old and Nightmare still don't have a gargoyle? XD
C'mon now, a creepyass mansion like that must have a stoned bat hanging around somewhere.
But other then that... I think almost all well known creatures of the night are present. We got zombies, skeletons, witches, vampires, demons, dolls, ghosts, werewolves, dragons, Cthulu, scarecrows, clowns etc. etc. Aside from the gargoyle I don't think there's any 'must-have' left.
I better go 'n play a Castlevania to see if I forgot any
Hairy Jack, Fear Liath, Black Dog, Afanc, Jack Frost, Jack o' Lantern, Ogopogo, Nessie, Poltergeist, Gashadokuro, Utai-Gaikotsu, Itsumade, Jueyuan, Kaiming Shou, Gu Huo Niao, Zhu Tun She, Shan Xiao, Gandarewa, Pocong, Rangda, Draugr, Will-o-Wisp, etc.
A lot really, a lot.
Maybe the Mad Hatter? Not so much a monster as it is something that has incredible potential to be freakishly creepy? And of course transylvanai 1 the necromancer.
They need that Japanese legend involving that girl with a slit-open mouth. Words can't describe it accurately, but this story gave me nightmares as a child, and when I saw the film adaptation
Blood thirsty unicorns,ogres,shinigami, and lycans should be near the top of this list.
Anything from the Stephen King books would be huge also.
Addams family & if you decide to cerate gill-man for the Nightmare clan can you please give him.poison 2,min 1 & power+2