Pre-Series
Sometime during his childhood, Helia befriended Krystal, the Princess of Linphea.
Once he was old enough, Helia began attending the Red Fountain School for Specialists for a short while until he decided to drop out to pursue his passion for the arts. He attended an art school for about a year before making his return to Red Fountain during the events of Season 2.
Seasons
Season 2
In "Party Crasher", he is introduced to the Winx. Brandon notes that he is a pacifist, and used to be one of the top students at Red Fountain until he dropped out to pursue the arts. Timmy reveals that he is Saladin's nephew. Overall, he appears to be very quiet and a very good artist. Later on in the episode, when Lord Darkar sends a huge monster to attack Red Fountain, Flora is blindsided by the monster and about to be attacked, Helia saves her by holding back the monster with the strings from his glove. He smiles at Flora and lets go of the monster, angering the Winx.
Throughout the season, Helia has had a minor role, yet he appears a couple times in episodes. In "The Invisible Pixies", Flora sees Helia but fails to give him a love letter.
During the camping trip, Helia arrives just in time to save the Winx and the Specialists from the Trix. As the group claims that the vacation was over, Helia jokes around saying he just got there.
In the episode "The Time for Truth", Helia and Flora confess that they like each other. He blows her a kiss before departure.
At the end of the second season, before the Winx enter the fortress to save Bloom, Flora apologizes for not telling him her feelings sooner, and in return, Helia boldly kisses Flora.
Season 3
Helia does not appear much throughout the third season, although, he does go on the mission to the Omega Dimension to rescue Tecna. Helia also helps the others take the Flying Bikers' bikes, thus helping the Winx stop King Radius's wedding. He also was the only Specialist to report back to the Winx after Valtor attacked the rest of the Specialists.
Season 4
Helia, along with the other Specialists, go to Earth to help the Winx. His new look consists of the original outfit but with his hair changed it into a rag-cut. This change in appearance does not happen until a few episodes after the Love and Pet episode. He also helps Riven get Musa back.
Season 5
In "Return to Alfea" When the Specialists visit the Winx at Alfea, Helia gives Flora a special origami. However, they are interrupted when Princess Krystal of Linphea appears. It is revealed that she and Helia were childhood friends. Krystal clings onto Helia's arm and mentions that they need to catch up, which upsets Flora. Helia later gets hit by Darcy. Krystal and Flora take him into the hallway and Krystal uses her healing powers to help him.
Helia makes a few cameo appearances and appears in a few episodes like "Trix Tricks", "The Devourer" and "A Perfect Date" but he does not have a major role until "Listen to Your Heart".
He was watching the Winx (minus Bloom) in a Volleyball game. When they lost, Helia was about to go and speak to Flora but was interrupted by Krystal who came up and hugged him. However, unknown to either of them, Flora saw them together. Upon seeing Helia and Krystal it made Flora even more upset, causing her to leave. Helia congratulated Krystal, but revealed he needed to speak with Flora, but became disappointed when he discovered she was gone. Later as Sky was attempting to leave Eraklyon for the game at Alfea, Helia called Sky, informing him he missed it. During that time, Helia offered Sky advice towards his relationship with Bloom, informing him, he should talk to Bloom as soon as possible, knowing he needed to do the same with Flora as their relationship was being threatened by Krystal's interference.
He then appeared at Stella's fashion show, where he along with the other Specialists were helping Riven perform a song for Musa and appeared again helping to defend Paradise Bay.
Helia had another major role in "Battle for the Infinite Ocean". Flora was shown to be very hurt as she is still upset about the relationship between Helia and Krystal as Flora has begun to believe that Helia no longer wants to be with her and instead wishes to be with Krystal. At Alfea, Krystal apologized to Flora, revealing she never intended to come between them and tried to assure Flora that Helia truly loves her. Sadly, Flora wasn't convinced as she began to doubt their relationship. Eventually, during a ballet in the Alfea Dance Studio, Helia surprised Flora as he released many living origami birds he created. Helia and Flora shared a heartwarming hug, where Helia revealed to Flora that she's the only one he loves and they share a romantic dance together around the studio, causing Flora and Helia to levitate, both dancing on air, having finally reconciled.
Season 6
In "Inspiration of Sirenix", a party was being held in Domino to welcome the return of a corporal Daphne. Helia and his friends arrived and were greeted by Bloom and Daphne, He also helped defend Domino against the Beast of the Depths the Trix had summoned.
In "The Flying School", Helia and the rest of the Specialists were at Linphea College training with the Paladins and when the Winx arrived, When Selina summoned the Treants to attack the college, Timmy was there with the others trying their best to defend the school but failed and all were forced to return to Alfea in order to train some more.
In "Bloomix Power", After Daphne had found the weakness to the Treants, Helia and the others went back to Linphea College and successfully freed Treants.
Helia did appear in many episodes, but only made small appearances, eventually Helia had a big role in "Curse of Fearwood". Here, Flora decides to show Helia the Alfea Greenhouse, at first Helia is afraid they might get into trouble, but Flora reassures him by telling him she is now the caretaker of the Greenhouse. While they are admiring the plants they are interrupted by the sudden arrival of some students who have come for a tour, while Flora takes them on the tour she instructs Helia to look after the Grabbing Vines, however, they become frightened and attack him. Flora soon notices them and comes over to help Helia, he is a bit shaken over the event but becomes upset after believing that Flora is disappointed in him for not looking after them properly. Upset, Helia decides to leave the Greenhouse despite Flora's protests.
When the Winx, Specialists, and Paladins come to Fearwood Forest to look for the Totem, Helia is very focused on the mission and is shown to be keeping his distance from Flora, showing he is still upset from what happened earlier. When the Specialists and Paladins are looking for the Totem in the Forest they hear a howling sound, believing it's a monster Helia prepares for battle but becomes very angry after finding out it was really Riven playing a prank on them. They almost get into a fight, but before anything happens Sky intervenes before a fight can ensure. Coming Soon...
Season 7
Season 8
Movies
The Secret of the Lost Kingdom
Helia joins the rest of the Specialists and the Winx help Bloom to find her parents. He and the Specialists do not have a big part in the movie and mainly serve to help the Winx girls.
Magical Adventure
Helia plays a minor role in this movie as he helps the Winx and the Specialists save the positive energy that the Trix destroyed. He and the others successfully defeat the Ancestral Witches and the Trix.
Specials
The Shadow Phoenix
Helia appeared when the Winx visit Red Fountain and was seen drawing a flower. Flora soon develops a crush on him and wrote his name on her book. Helia also seems to like her and draws a portrait of her. Because of that, Flora does not consent in potion class after dreaming about being married to Helia. He also appeared with the Winx and Specialists to save Bloom from Darkar's ritual.