Midnight Private Eyes

Midnight Private Eyes is an American animated fantasy television series created by Dana Terrace for Cartoon Network. It was produced by Cartoon Network Studios and Flying Bark Productions.

Synopsis
The series follows Valerie Kipperson, a fiction-obsessed teen, settling into her new apartment after completing high school and ready for what comes next. What comes as a surprise to Valerie is that her new roommate is a vampire! The vampire, Cassius von Lovus-Shwarzius, is a mocking representation to his race, having replaced his taste for blood in favour of pizza of all kinds and developed a tolerance to sunlight over the centuries. Strapped on cash, Cassius reluctantly agrees to let Valerie turn their apartment into a detective agency for the supernatural creatures and cryptic entities seeking assistance when the sun sets.

Main

 * Valerie Kipperson - Fresh out of high school, Valerie is an eager teen looking to make a name of herself. She's full of imagination and enthusiasm, even more so upon learning that her town of Toronto has been housing monsters and other mythical creatures without her notice. Now serving as Cassius' partner in their apartment, she hopes to make the various clients cheerful with each night.
 * Cassius von Lovus Shwarzius - A vampire originally from 1800's Europe, Cassius is Valerie's roommate and partner. Cynical and lazy, he is secretly depressed over being separated from his beloved twin sister, Callista. Once a suave and charming individual, Cassius has now gotten overweight due to his newfound obsession with pizza to the point where he no longer wears his old velvet tuxedo; instead, he now wears a green track jacket over a blue t-shirt with baggy grey sweatpants and orange croc clogs. As the series progresses, he begins to warm up to Valerie after being put off by her energetic nature.
 * Tyler - Tyler is a curious merman who lives in a fountain near the apartment complex. Valerie befriends Tyler and teaches him human customs while getting swimming lessons in return. It's eventually revealed in season 3 that he is the lost prince of Atlantis.
 * Holly - Holly is a pixie who unwittingly serves as the "secretary" to the Midnight Private Eyes. She was originally in the apartment before Valerie and Cassius moved in, eventually working for them after starting their detective agency. While a helpful ally, Holly comes off as sarcastic and crass, mostly making fat jokes at Cassius' expense.

Supporting

 * The Mad Puppet - A reanimated marionette that once served as an occasional antagonist, the Mad Puppet now serves as an ally to Valerie and Cassius. His right hand is attached to a blue dog hand puppet that has a life of its own, resulting in them getting into squabbles.
 * Ophelia Pleasant - The daughter of the Mothman, Ophelia lives on the outskirts of Toronto after moving from Point Pleasant. She's resentful of humans because of what happened to her father after the “bridge incident”. Valerie made it her mission to befriend her (she adores her soft wings), regardless of her outlook.
 * Callista von Lovus-Shwarzius - Callista is a vampire and Cassius' older twin sister (to Valerie's shock despite their height difference). She was once a loner who relentlessly searched for her brother for hundreds of years, finally finding him in season 2 and noting on how poorly he took care of himself. In contrast to Cassius, she is in far better shape since she still drinks blood (as she puts it, blood is calcium to vampires).
 * Denki Yaiba - An Oni of the Raijin Clan, Denki is the physical opposite of Cassius in terms of size and weight. Mostly spending his time in human form, he styles himself as an unbeaten wrestler, too tough for anyone to take on.

Antagonists

 * Salazar the Cinco - An Ahuizotl that serves as a con artist and the first villain to appear in the series. He has a crew of Alebrijes that follow his orders. He has an obsessive desire to not only steal money, but to actually eat it, grabbing as much as he can with his five hands.
 * "Aunty" Alraune - "Aunty" Alraune is a woman fused with a large flower. She posed as a tender gardener and uses her beauty to lure in males to have more slaves for her garden. She has a special mist that causes hallucinations.
 * The Jersey Devil - The legendary terror of the Pine Barrens, the Jersey Devil is an “honorary demon” to the supernatural (by which it means he's infamous). Going by the name, Charles Leeds, he runs a pawn shop that sells cursed trinkets and artefacts.
 * Gibson - A mad scientist Gremlin who seeks to overthrow humanity in the name of an unknown benefactor. Unlike the rest of his fellow Gremlins, Gibson controls his destructive nature and focuses his studies on the works of the Italian Renaissance Masters.