[Snake]

At the very least Dullahan would break the monotone, since those tend to be a very obvious cause of problems involving violent outbursts aside Corrupted.

Liches and Vampires? Not really. At least not 'from Mainland'. If they'd ever get ported to Korvara, I would wish to see them being variants of the original lore.

Ghouls and Bloodsuckers, or whatever.