Ephira made her first appearance in the first book when Kendra saw her on Midsummer's Eve and again at the Forgotten Chapel where she attempted to help Muriel set free Bahumat and destroy the preserve. She is described as a female apparition in black flowing garments that can entangle others in darkness, and is a dominant character in the third book. She used to be a beautiful hamadryad that fell in love with a former Fablehaven groundskeeper, who left her for another woman. Being a hamadryad, she was linked to a specific tree. After the Sphinx set the Dragon Prince free, he retrieved the revenant's nail and drove it into the tree. With this evil power, the demon Kurisock merged with Ephira's tree. With Ephira's enhanced power from the nail, and Kurisock's aid, she was able to turn creatures of light into creatures of darkness, started the dreaded Shadow Plague.
Bahumat is an ancient demon who plagued the Fablehaven area it was founded. Some Europeans imprisoned him in exchange for acknowledgment of ownership of the land that he had terrorized. Fablehaven was founded on this land. He is bound by knots similar to those that bound Muriel, but in greater multitude. Bahumat is not seen till the end of the first book as Muriel is trying to release him. She succeeds, but the fairies prevail in the end and imprison him underground.
Muriel is the first villain of the Fablehaven series. She used to be the wife of a previous caretaker, but she became enamored with dark magic and witchcraft. For her crimes she was imprisoned in a shack on the grounds of Fablehaven, held from using magic by a rope with magical knots tied in it. The knots could only be undone by a human who asked for a favor of their own free will. The person would blow on a knot and Muriel would use the magical power released by unraveling the knot to grant the person the favor they sought. She was freed by Kendra and Seth when she used the power of the final knot to transform Grandma Sorenson from a chicken to herself. She then attempts to free the demon Bahumat and overthrow the preserve.
Christopher Vogel is an agent of the Society of the Evening Star. He met Kendra and Seth outside their school using the name Errol Fisk. He impressed them with his magician's skills, and told them he was sent by Coulter Dixon to get rid of the kobold Case. He convinced Seth to break into a mortuary to get a frog shaped statue, who turned out to be the demon - Olloch the Glutton. He tried to convince Kendra and Seth to accompany him on another mission, but they were warned by Grandpa Sorenson that he was not a friend, and likely a member of the Society of the Evening Star.
Vanessa is a friend of the Sorensons, with a strikingly beautiful appearance, and a fancy souped up sports car. She first appears at Kendra and Seth's home. She has been sent to pick them up and take them to Fablehaven, escaping Errol. She is presented as a keeper of magical creatures. She is a Knight of the Dawn, and helps fellow knights Coulter and Tanu with their efforts to find the secret artifact hidden at Fableahven, until she is revealed as a narcoblix and traitor. Her abilities give her power to control others while they are sleeping. She had been secretly working for the Society of the Evening Star for a while by the time she was revealed. Once her plan is thwarted she was imprisoned in the quiet box, but leaves a message with Kendra revealing the Sphinx as a traitor. She is hoping to be released from confinement, expressing her desire to switch sides and help them defeat the Sphinx.
Kendra and Seth were introduced to the Sphinx in the second book. He was well received in the magical community as the most trusted and wise ally. He is described as a black man with short beaded dreadlocks. The Sphinx is the one who tells Kendra she is fairykind, and offers to help her develop her new abilities. He's been a leader for the cause for hundreds of years, until suspicions arise when Vanessa reveals that he is a traitor. It is discovered that his ultimate quest is to obtain all the keys to the demon prison - Zzyzx, becoming the greatest enemy of the Knights of the Dawn. The Fairy Queen tells Kendra that he is a man and not another being in disguise, and attributes his age to magical tampering.
Mr. Lich is The Sphinx's bodyguard and assistant. according to Navarog he is a powerful viviblix; a vampire like creature able to reanimate the dead. he assists The Sphinx and rarely speaks.
He is a box with the powers of trapping people inside him,Case transformed to human form in an attempt to trap people inside him.Casey is offically called a Bodebox,his popularity got down when one of Kendra's friends went on a date with him,as Case tried to trap her in him.
Olloch the Glutton is a demon who spends most of his time in a state of dormancy. While dormant he appears to be a statue of a frog. Seth is tricked into feeding the statue, thereby awakening the demon. The statue bites Seth, marking him as the target of the demon. The demon slowly comes to life and begins an unrelenting quest to find and devour Seth. He eats along the way, and as he eats he grows in size and power. He manages to breach the barriers of Fablehaven, and eventually succeeds in hunting down Seth, but Seth is protected by the fairy cocoon given to him by Coulter. Olloch consumes the cocoon and Seth passes through the demon's digestive system inside this cocoon and ...comes out the other side... safely. This satisfies the demon's quest, and Olloch returns to his dormant state.
When the Sphinx replaced the current occupant of the Quiet Box with Vanessa, he took into custody the previous occupant. Graulus the Demon revealed to Seth that the prisoner the Sphinx took out of the Quiet Box was in fact, Navarog, the Demon Prince, Lord of the Dragons, and that the Sphinx released him to retrieve the revenant's nail, starting the ball rolling that would plunge Fablehaven into the Shadow Plague. Once he gave the nail to the Demon Kurisock he left Fablehaven to perform tasks given him by the Sphinx that would eventually set the stage for the plot of book 4.
Villian Descriptions from wikipedia.org
