Time to restart this favorite thread again.
YKYWFW the only person in your cast who wouldn’t get sunburned after a day at the beach is the vampire.
YKYWFW the werewolf is the practical, levelheaded one.
YKYWFW the most genuinely devout Christian in your cast is both a vampire and one of the villains.
YKYWFW your romantic couple has their Big Misunderstanding™ resolved in the aftermath of an attack by a feral vampire.
YKYWFW your character in med school is majoring in Supernatural Medicine.
And the man who is in charge of the labs is a vampire – who first got into the place as one of the cadavers and terrified everyone by sitting up in mid-dissection (grave robber era).