Okay, now for Mario's. First, a list of “regular monsters,” then, some expected “not really spoiler” bosses.
REGULAR BADDIES (called “Ecto-mooks” in the game.)
DISEMBODIED: The spirit of one who was “scared” right out of their body.
RED CAP: A scottish imp with murderous tendancies
CULTISTS: Mad zealots who want to awaken some dark deity.
TRICK OR TREATER: The embodiment of the urban legends of kids who died on halloween night.
POLTERGEIST: A specter that tosses objects about.
ZOMBIES: Undead carcasses animated by voodoo magic.
NON-SPOILER BOSSES:
SAMHAIN: The druidic hallows eve harvest god…the king of the night creatures (I mentioned him before).
CAJUN KATIE: A voodoo Mamba (sorceress).
FIRE DRAGON: A dragon made out of Psycho-reactive fire.
TOP-HATTER: A goofy “invisible man” wearing a tux and top hat.