Domino (renamed Sparks in the 4kids version) is a planet that was the final resting place for the Great Dragon who created the Magic Dimension. Other than Bloom and Daphne, the following characters are from Domino.
King Oritel and Queen Marion/Miriam are the King and Queen of Domino and the parents of Daphne and Bloom. They first appear in season two, episode nine, in Bloom's dream. King Oritel has brown hair and Queen Marion has red hair like Bloom, though Marion's is extremely curly and her hair color is ligher then Bloom's. They are very powerful and a threat to Valtor. They are friends with Faragonda, Griffin and Saladin, who tried to help them in fighting off Valtor. In episode 24 of season three, Bloom goes to Cloud Tower in search of the Three Ancestral Witches. They reveal to her that Valtor lied to her - her parents are not trapped within him, as he pretends they are, but that her parents are still alive in a place beyond magical dimension's reach. It is revealed in the movie that King Oritel and Queen Marion are trapped in a dark realm called the Circle of Obsidian with the Three Ancient Witches themselves and an evil sorceress named Mandragora. After Bloom destroys Mandragora and the Obsidian dimension, Domino is revived, King Oritel and Queen Marion are freed, and happily reunited with their now grown up youngest daughter. King Oritel is voiced by Josh Keaton in the Nickelodeon dub. Queen Marion is voiced by Larisa Oleynik in Season 5 of the Nickelodeon dub and by Grey DeLisle in Season 6 of the Nickelodeon dub.
Lord Bartelby was the official scribe of King Oritel and wrote the Book of Fate for him. His spirit now resides in the book. He is voiced by Michael Bell in the Nickelodeon dub for "The Secret of the Lost Kingdom."
Peg is a female horse gifted to Bloom by her parents in movie "Winx Club 3D: Magical Adventure". She transforms into an Alicorn by eating the seedling on lost city of Havram, Eraklyon.
Serena is the gatekeeper of Domino's ocean portal and is bonded with the youngest princess of Domino. She is voiced by Laura Bailey in the Nickelodeon dub.