He has a strong sense of duty that sometimes puts him at odds with Bloom or Riven. He is aware of Bloom's previous relationship with Andy, but has no outward antagonism towards the musician. He is genuinely irked by how close they act though, possibly because he is inexperienced with non-royal, or Earth, mannerisms. He is shown to be an excellent swordsman. His translucent, blue phantoblade is styled after a longsword, and he also uses a matching blue phantoshield, a boomerang and a hoverboard (all translucent like his sword). He is also a competent archer and can fight dragon back in the air or telepathically.
In Winx ClubEdit
In the first Nick special, Sky did not switch identities with Brandon.
Winx Club: Revenge of the TrixEdit
Like in Season 1, he takes Bloom to Cloud Tower. While in Magix City, Bloom tells Sky she wants go to the library in Cloud Tower, Sky agrees to help her get in. While at Cloud Tower, Bloom learns that she is actually a witch. Stella, Flora, Tecna, and Musa are worried about Bloom because she never came back last night.
Bloom calls Sky and tells him it was all a trick from the Trix. Bloom arrives at Red Fountain to find Sky with another girl, Princess Diaspro, but Bloom thinks it is another trick from the Trix. Bloom transforms into a fairy and fights Diaspro, Bloom finds out it was not a trick from the Trix, and that Diaspro is Sky's fiancée.
Winx Club: The Battle for MagixEdit
Sky felt terrible about not telling Bloom about Diaspro and having her find out the hard way, and he tried to call her to set things right, but was blocked by Stella. He joins the other specialists at the battle of Red Fountain and evacuates with the others as the school falls. He joins Bloom in a meeting with the faculty about trying to get her powers back. He accompanies Bloom, Stella, Brandon and the reformed Knut to Cloud Tower along with Riven, who he apologizes to.
He and Bloom escape from Cloud Tower on a Wind Rider bike, but become caught in the defense system and crash in the woods. They survive, but the bike was in no condition to take them anywhere. Sky headed to Magix while Bloom headed to Lake Roccaluce, and got in a fight with three creatures of Decay. Luckily Bloom, with her powers restored, was able to save him and get him back to Alfea in time for the final battle.
In this season, Sky and Bloom continue to hang out with each other. After hearing a rumor about him and Diaspro, Sky assured Bloom that there was nothing going on between them. During the Pixie rescue mission, Sky became flustered with Aisha, which caused Bloom to become jealous, though Aisha's actions towards Sky were more out of respect than passion. He also displayed annoyance over how Bloom kept gushing on about Professor Avalon (who was a fake at the time).
In Episode 10, he was actually killed by Icy, but was then saved by Bloom's healing powers, and Bloom accepted him as her boyfriend. Sky also managed to later introduce Bloom to his parents, whom were wary of her at first. Even though Sky no longer had any romantic feelings for Diaspro, he wanted to save her from Yoshinoya's clutches, not wanting her to get hurt because of him. When Darkar converted Bloom to Dark Bloom, Sky was determined to save her. Even when everyone got paralyzed by a heavy gravity spell, Sky's determination did not waver as he managed to actually stand up and walk towards Dark Bloom despite the heavy gravity he was under. He pleads with Dark Bloom to wake up and return back to the girl he loves dearly. His confession finally brought Bloom back to herself in which they then defeated Darkar. During the celebration party at Alfea, Sky goes to search for Bloom where they are happy that the ordeal was finally over then share a kiss, which Lockette gushed over. Afterwards, Sky and Bloom comically mess up the photo sessions in the end.
Winx Club: The Shadow PhoenixEdit
Sky celebrated the fact that the Trix were gone. Later in the series, he was jealous because Bloom was hanging out with her new teacher, Professor Avalon, who (unknown to either of them) is really Lord Darkar (The Shadow Phoenix). When Bloom became Dark Bloom, Sky talked to her about how much he cared for her. These words allowed Bloom to break free of Lord Darkar's control and she and Sky became a couple once again.
Sky's relationship with Bloom seems to be going perfectly. He was planning to make his relationship with her public on Eraklyon, but before he could, he gets slipped a mind control substance from Diaspro provided by Valtor. He had become under Diaspro's control, branded with Valtor's Mark, and makes him publicly say his relationship is now with her instead of Bloom. To hurt Bloom further, Diaspro then makes Sky attack the Winx on accusation that they are in league with Valtor. When Bloom and the others tried to infiltrate Sky's castle to find out what is happening, they discover the truth about his ailment once finding Valtor's Mark on his shoulder. Fortunately, Stella used her healing power to revert him back to normal. A few episodes later, Sky meets up with Bloom at Alfea after she found out her friends were all in the Omega Dimension. They reconcile and Sky revealed that Diaspro had been banished for what she did at Eraklyon. They then go together to rescue everyone else in the Omega Dimension. In the final episode, Sky, along with Brandon, Riven, and Timmy get held for ransom by Valtor while a firemonster impersonating Sky created by Valtor using the spell of the elements attacks Bloom. Sky tended to Bloom's body when her soul left to fight within Valtor. Once Valtor was destroyed, Sky was elated to see Bloom's body and soul reunited again.
The Secret of the Lost KingdomEdit
In the movie, Sky helps Bloom to find her parents and discover her real identity. He had fallen under suspicion by Bloom when a young lady calls him away to Eraklyon for something. Sky tries to explain what that something was, but Bloom tells him to wait until their current mission was over to tell her because she thought knowing would cause her to be distracted. In the climax, Sky uses Oritel's sword to help defeat the Ancestral Witches, following the prophecy that only a "crownless king" could pull out the sword and survive. It was then revealed that the something Sky was called away for was to attend his coronation as the new King of Eraklyon, thus allowing him to fulfill the requirement of being a "crownless king" in the prophecy. During the celebration ball later, Sky asks Bloom to be his princess and she accepts.
Sky and the other Specialists arrive on Earth to help the Winx find the last fairy on Earth and defeat the Wizards of the Black Circle. In order to set up a base of operations, he sold the Seal of Eraklyon to get some startup cash. He was shocked to find out that Bloom used to have a boyfriend, Andy, on Earth before the beginning of the series. He and Bloom had an argument after the Black Circle retreated but later reconciled after stopping some out of control pets. They had another argument about Andy courtesy of Mitzi's meddling but later reconciled after Bloom got her Believix. During the season, he and the other Specialists, receive jobs working under Roxy's father, Klaus, at the Frutti Music Bar.
Winx Club 3D: Magical AdventureEdit
Sky asks Bloom to marry him and Bloom is very happy. He announces the news to his father, Erendor, but his father does not allow Sky to marry Bloom so Sky was forced to cut off the engagement.
When Oritel is looking for the prince who will marry Bloom, Sky comes in disguise and tries to explain to Bloom why he could not marry her. Oritel realizes it is Sky in disguise and bans him from the castle.
In Season 5, Sky changes his hair style and is presented as the Crown Prince of Eraklyon again instead of as King, and he intends to give the Pendant of Eraklyon to Bloom but looses it after saving humans from an oil rig explosion. In Return to Alfea, he shows up at Alfea after the rest of Specialists, but a moment later he is reminded of his loss and leaves the area. Later in the episode, he joins fight with the Trix and sacrifices himself before Icy hits Bloom. That causes him fall from high and ultimately gets amnesia. However, when Princess Krystal tries to heal him, she states that there is something, that he does not want to remember, which blocks her efforts. While Sky cannot remember anything, Bloom is doing her best to save her love. In The Power of Harmonix, Bloom, Musa and Tecna were fighting the Trix. Sky fights against the minions, but he does not remember how to use a sword. Bloom saved Sky and caused her to fall. The Trix attempts to hit Bloom with their spells, Sky protects Bloom, however, Bloom protected Sky instead by using Dragon's Embrace, her new spell in her Harmonix form. In The Secret of the Ruby Reef, Sky does not remember how to dance, then he looked at Kiko, and Kiko shows him the moves to which Sky follows. But when Kiko stumbles, Sky and Bloom also fall. Bloom also brought Sky near the Lake they find the pieces of the Destiny Shell, and they formed the shell into heart. Sky later goes to Domino for his courage ceremony where he fights off the Trix with Oritel and Marion. Later, Flora gives him the Pendant of Eraklyon which brings back his memory as he gives it to Bloom and tells her that the Trix have Daphne and forced her to tell the secrets of Sirenix. But the only time when Bloom tried to help Sky was the time when Krystal interrupted them. So Bloom got away and it was a chance for Diaspro to talk with Sky.
On Sora's TeamEdit
When Bloom joined the team, Sky also joins but also behind his fathers back, and he enjoys going on missions in other worlds with his new friends. He even wants to help Sora with his relationship with Kairi.