Ulysses Moore

The story of the first seven books focuses on the Doors of Time and their keys. There are several Doors of Time spread around the village, and each door requires its own unique key to open it. Once opened, it leads to a distant time and space specific to that door and it can only be reopened when all of the travelers who passed through it return.

The only exception is the Door of Time inside the Argo Mansion, which can take the traveler to any place he or she wants, as opposed to the fixed locations the other Doors offer. However, four keys are needed to open that one, making it the most difficult door to access. This particular door leads to a cave where there is a lake and a boat called "Metis" used to take the Travelers to their destinations.

• Jason and Julia Covenant live at the Argo Mansion, but are from London. They are twins and are eleven years old in the first book and turn thirteen in the seventh book. Julia is a little taller than Jason. Both are blond and have blue eyes. In the sixth book, Julia starts dating Rick Banner and in the eighth book Anita Bloom becomes Jason's girlfriend.
• Rick Banner is one year older than the twins and has always lived in Kilmore Cove. He is a redhead and his father died when he was young. In the sixth book, it is revealed that his father died because he was searching with Leonard Minaxo for the First Key.
• Ulysses Moore was married to Penelope Moore and they were the owners of the Argo Mansion. Nestor, the butler of the Argo Mansion, is actually Ulysses Moore, who uses this disguise because the village people bothered him. After the death of his wife, however, Ulysses stayed on as butler at the Argo Mansion
• Penelope Moore was Ulysses' wife. They met on a trip to Venice, and fell in love.
• Leonard Minaxo is the lighthouse keeper of the village and was a member of The Imaginary Travelers club, as were Ulysses and Penelope Moore. Towards the end of the sixth book it is revealed that Leonard had a secret passion for Calypso, the librarian.
• Anita Bloom enters the story in the seventh book. She lives in Venice, Italy, with her mother while her father lives in England. She finds a book from a painter who also belonged to The Imaginary Travelers club and with the help of Ulysses Moore's diaries she goes to Kilmore Cove to find the Covenant twins.
• Nestor is the caretaker of Argo Manor
• Oblivia Newton is a millionaire, who wants to control all the doors and is the villain in the 1-6 books