After a brief discussion and much thought from me in the Discord chat, I present to you...

"Ah, Alucard. What is your business here?""I've come to put an end to this."
M__: Nocturne of the Moonlight
Cardflip
17 Players: 4 Mafia, 12 Town, 1 TP
Five years after Richter Belmont's conquest of it, Dracula's infamous Castlevania remains intact, and the legendary hunter has vanished. Alucard, son of Dracula, is awoken to investigate the mysterious castle. Before long he is joined by Maria Renard - an old ally of Richter's - and they learn the truth behind the mystery of Castlevania's remains...
Fending off the Dark Priest Shaft, hellbent on reviving the Prince of Darkness Dracula himself, the priest panics. At this rate, the combined forces of Alucard, Maria and Richter would be too much for his master! In his panicked state, Shaft calls upon his magic to disguise everyone present within Castlevania! Quickly contacting his allies, he forms a plan to rid them of the hunters, while they too figure out just who is who. The battle between Light and Dark begins anew...
And no man can say who shall be victorious.
Dracula's Forces: Those who lurk in the dark. Wins when Belmont's Allies are outnumbered.
The Prince of Darkness, Dracula: "What is a man?! A miserable little pile of secrets!" Infamous villain he is, Dracula is in some ways aggressive. He can engage a player each night, distracting them and thus preventing them from using their ability. He can also hold his ground, and prevent any abilities from being used on him. If he does this, Alucard will see him as 'a friend.' Eventually, though, Dracula will grow tired - he can only hold his ground twice throughout the game.
The Dark Priest, Shaft: "This world must be cleansed in the forge of Chaos." Using what is left of his magical powers, Shaft can disguise any player to further extremes: they will cardflip
black for the following day. Alternatively, he can silence them, making them unable to speak on the following day. He cannot use his magic on himself.
The End, Death: "You shall regret those words." Death isn't particularly into this whole thing, but does feel the need to do his job sometimes. He can kill independently of Dracula's Forces on every even numbered night.
Spear Guard: Shaft brought this monster along for the ride, but it can't do anything special.
Belmont's Allies: Those who fight for the light. Wins when Dracula's Forces are eradicated.
Scion of Legend, Richter Belmont: "Your words are as empty as your soul." A headstrong, fierce vampire hunter. Richter's impatience grants him the ability to strike down who he pleases every night. However, should he strike an ally, Shaft's power will grab ahold of him, making him cardflip
red for the rest of the game.
Vampiric Heir, Alucard: "Demon! Death is too good for you." Alucard, familiar with the castle's standard residence, can investigate one's actions each night, and identify them as friend or foe. Familiar enough with the scent of a Belmont's blood and his ally Maria Renard, Alucard can easily identify anyone in the castle by name.
The Huntress, Maria Renard: "I'm sorry. I can't let him disappear from my life." Despite not being the child she was five years ago, Maria retains her youthful kindness. Every night she can visit someone to take one of two actions: she can watch from afar and see who visits them, or protect them from any harm. In protecting them, however, they will not be able to use their own abilities.
Paragon Knight: A knight capable of protecting himself against Dracula's Forces. Immune to nightkills.
Knight: A knight from Maria's village brought along to assist her initial investigation, but ultimately caught up in Shaft's magic. Has no special abilities.
Knight
Knight
Knight
Knight
Knight
Knight
Axe Armor: A self-aware monster who decided to side with Belmont. However, he hasn't quite lost all his old habits, and the uninformed would find him suspicious. Doesn't know he's suspicious.
The Librarian: He who seeks only his own prosperity. Wins if he survives the game.
For Money, The Librarian: "Really? In that case, just tell me what you need." Although taking residence in Castlevania, the Librarian ultimately works to his own benefit. To this end, the Librarian has two options every night: he can kill a player, or protect them. His survival does not cost the other winners their victory, so killing him is not a priority.
EDIT ONE: Buffed Alucard to be able to identify anyone by their exact role. Adjusted flavour text.
EDIT TWO: I fixed wording and formatting
EDIT THREE: Added Paragon Knight, Death (can't believe I forgot him), and an extra Knight. Ups total player count to 17.