Bram is a vampire and a newly-arrived student at the school. He could not wait to get out of Transylvania and experience the world. Bram joined every sports team and club at Monsters Castle he could, and is always ready for any adventure or for simply hanging out at the mall. Bram is up for anything to avoid doing his homework.

Bella is Bram’s sister and is not as outgoing as her brother. Bella prefers to stay in her room and paint or write poetry, but the other girls make it their mission to show Bella she needs to experience life before she can paint or write about it.

As an invisible boy, Wells has a personality as transparent as his body. Wells knows who and what he likes, and always says whatever is on his mind. Unless Wells is wearing clothing, he is completely invisible, which he uses to his advantage to get out of classes or get into movies.

Cleopatra is an Egyptian princess whose vanity and self-centeredness is in no way diminished by the fact that she is now completely wrapped in bandages. She is smart and witty and likes the vampire siblings because, as children of a count, they are the only other nobility at the castle besides Cleopatra herself.

In most ways, Lupe is a typical teenage girl, she is up on celebrity gossip, struggles with her geometry homework, and is shy around the popular boys. For Lupe, however, her shyness comes with a socially awkward side effect. Lupe is a werewolf, and whenever she has strong emotions, she turns into her wolf self.

Despite the fact he is a Frankenstein's Monster, Dr. Frank is regarded as one of the most intelligent, well-read, and cultured members of the faculty both from his long life and what he's learned along the way.

A fashionable goth-looking teacher. She looks like she’s in her 20’s, sometimes acts like she’s 18, but is really houndreds of years old. Viisephanie is the subject of many rumors from the student body regarding whether or not she is a witch, a vampire, or something more mysterious. In her younger days, Vivisephanie had an intense passion for exploring the world, and now that passion is directed at making sure her students are prepared for that world.