Other than Prince Sky and Brandon, the following characters are from the planet Eraklyon.
King Erendor and Queen Samara are the King and Queen of Eraklyon and the parents of Sky. They first appear in season one, episode 17, where they are together with Princess Diaspro to watch a show at Redfountain in which Sky appears. Before season one, they paired their son up with Princess Diaspro as his fiancée, but Sky manages to get out of the engagement to be together with Bloom. They don't like her very much until season two, episode 14, in which she helps save Diaspro. King Erendor is voiced byPeter Emswhiller in the Nickelodeon dub. Queen Samara is voiced by Candi Milo in the Nickelodeon dub.
Diaspro is a member of Eraklyon's nobility and was Sky's fiance until he met Bloom. She tries to win Sky's affection back by allying with Valtor and having herself nominated as the King's liaison officer of Eraklyon but fails. In Season 6, she joins the Trix. Diaspro is voiced by Veronica Taylor in the 4Kids dub, Ariana Grande in Season 1-5 of the Nickelodeon dub, and by Cassandra Morris in Season 6 of the Nickelodeon dub.
Thoren is a paladin who is Sky's cousin. He is voiced by Charlie Schlatter in the Nickelodeon dub.
Lady is Sky's pet dog. Lady only appears in the first season.
Yoshinoya is a powerful man who wants to take control of Eraklyon and it is because of him that Sky and Brandon had to switch identities in Season 1. In Season 2 he kidnapped Diaspro but the Winx saved her.