You haven't seen the show much ...
This is something that seems to happen: a vampire, a werewolf and a ghost all come together under one roof. A roof with all three together brings stability for the three, and gives them strength to face down world-breaking threats such as ambitious old vampires trying to take over the world.
Vampires walk about during the day in this series. They can also go dry - abstain from blood drinking, kind of like alcoholics giving up the booze.
Werewolves only suffer the curse once a month, and when they transform they become truly monstrous beasts. The entire third season had a subplot involving a pregnancy where both parents were werewolves.
When a person passes on, their ghost typically remains behind until their last task is resolved. When that happens, Death comes for them, taking the form of a doorway that opens to reveal Light behind it. Spirits in the Afterlife communicate through television and radio. A ghost is said to have a "root" (place where he or she is attached) and "familiars" (the vampire and werewolf). If she loses both, she unravels, fading on the breeze like dust, like smoke.
Ghosts also have abilities such as sharing tastes and sensations of foodstuffs, and sharing memories with others, through physical contact. They can only be seen by vampires, werewolves, other ghosts and humans - only when it is a really scary moment.
And the way the setting is arranged, the characters do not need to go out and seek trouble.
Trouble always comes for them.