Like the rest of her sisters, Darcy demonstrates a sadistic personality. She is seen laughing after turning Mirta into a pumpkin, and happily pummels Bloom before taking her powers. She also shares their lust for power. At the same time, she is the one most likely to fall in love with a boy. In season one, she seemed genuinely attracted to Riven even while she was manipulating him. To date, she has only shown one moment of compassion, when she expressed concern for Riven's safety. She is less aggressive than Icy and Stormy, but is the most cunning. Darcy is the middle sister of The Trix. She had huge dislike of Tritannus ever since they first met. She was the one to convince Stormy to leave him and one to try to convince Icy to do the same.
Story in Winx ClubEdit
Darcy appeared in episode 1 as a spectral entity. Her actual physical appearance was in the following episode. While Knut was telling Icy and Stormy of what happened, Darcy sense Bloom's presence and divided herself. While her clone stayed behind, making it look like she never left, the real Darcy disappeared, reappeared right behind Bloom and attacked her. After Bloom was found out Darcy was the second to attack her. After the Winx got away, she along with Icy and Stormy went back to Cloud Tower.
Darcy was used in yet another plot to steal the Ring of Solaria: To say that Prince Sky asked Stella out on a date (which was a trap). When Stella showed up without the ring, Darcy returned to Alfea disguised as Stella and attacked Bloom. A short while later she was found out and she dropped her facade. She returned to Cloud Tower with Icy, Stormy and the Ring of Solaria.
Winx Club: Premiere SpecialEdit
She is seen with the Trix attacking Bloom in Magix. Darcy copies herself in two (like in the orignal verison) and kicks Bloom from her hiding place.
Winx Club: Revenge of the TrixEdit
With the Trix, she go to Gardenia to search for Bloom and steals her power after revealing to her that she is the princess of Domino and that Daphne was her elder sister who sacrificed herself to save her.
Winx Club: The Battle for MagixEdit
She and her sisters try to conquer the whole Magic Dimension and fights the Winx Club in a final battle, till she is trapped with Stormy while flying by Faragonda and Griffin and are sent to the Fortress of Light
In Season 2, Darcy was disguised as a gypsy and hypnotized Jared into channeling her magic into the Magical Reality Chamber (again, though she did it the first time herself). She and her sisters were working for Darkar and tried to destroy the Winx. In the first season, she and her sisters would call them pixies, but now Icy and Stormy call them geeks, nerds, while Darcy calls them "teeny-boppers."
Winx Club: The Shadow PhoenixEdit
In The Shadow Phoenix, Darcy and her sisters are freed from the Fortress of Light by Darkar who gives them Gloomix powers and they become his servers, fighting the Winx and stealing the Codex from the Pixie Village under his orders but once Darkar turned Bloom into Dark Bloom and was about to enter the Realix dimension to seek the ultimate power the Trix told him that they expected him not to forget them and Darkar betrayed them by sending them to the Fortress of Light again.
Darcy along with the rest of the Trix were sent to the Omega Dimension and freed Valtor and fought most of his battles.She also had small crush on Valtor a carved his face into a rock which made Icy and Stormy jealous and at the end she and the Trix were arrested for teaming up with Valtor.
The Secret of the Lost KingdomEdit
After the Ancestral Witches are defeated by Bloom. The Ancestral Witches seek out for younger witches and find the Trix. Then Icy says" those Winx better watch out next time, cause they don't know whats coming"
Winx Club 3D: Magical AdventureEdit
She returned again in the second movie, where she and sneaked into Alfea during the beginning of year festivities, putting a spell on all the food there so that everyone who ate some of it would turn into a toad, and stole a magical compass which they used to lead the Ancestral Witches to the Tree of Life, found in the Pixie Village. The Ancestresses proceeded to absorb all the essence of Good from the Tree, causing all good magic to disappear, and only dark magic to keep on existing. At the end of the movie, the Winx Club, the Specialists, Oritel and Erendor arrive at the haunted city of Havram to find the sapling of the Tree of Life which the Ancestresses gave to the king of Eraklyon as part of the deal which forced him to betray the promise he made to Oritel (that he would protect Domino against the Ancestresses) by allowing the three Ancient Witches to destroy Domino in exchange, they would spare Eraklyon. There, the Trix and their Ancestresses were waiting for them, but the Winx Club girls gained back their powers and Bloom's horse, Peg, became a flying unicorn, thanks to the magical sapling, which restored all the Good Magic of the Magic dimension after being hit by an attack of Icy initially aimed at Bloom. Finding the Trix to be ineffective to defeat the Winx Club and as punishment for releasing the Good Magic, the Ancestral Witches try to possess the Trix, but as they attempt to flee the old witches capture them and possess their bodies. The Trix, now possessed by their ancestors, have become more powerful than ever, as well as mere puppets possessed by the Ancestral Witches. The Winx, the Specialists, Oritel and Erendor take part in the battle, but Erendor is severely wounded trying to save Bloom from Icy-Belladone. Finally, using a Believix convergence, the Winx Club are able to summon the essence of the Great Dragon and extract the Ancestresses from the bodies of the Trix. Dragon Flames power destroys the Ancestral Witches for good, and the Trix, defeated, fall unconscious to the ground. Helia ties them with a rope and, as the movie ends, they are shown as being suspended from the flying ship the Winx, the Specialists, Oritel and Erendor use to leave Havram, getting angry as Bloom and her friends fly around them and tease them.
The Trix later race with the Winx to find the Lilo plant to become more powerrful but are defeated by the Believix powers of the Winx. Darcy and the other Trix are seen in the prison of Andros where they meet Tritannus. After he turns into a monster by absorbing pollution from an explosion on an oil rig on Earth that spread through the oceans and reached his cell on Andros he and the Trix escape from prison together. In episode Return to Alfea, after power up from Tritannus she was able to hypnotize Stella until distraction.
Darcy is not personally very keen on the idea of joining up with Tritannus, only doing so because it kept her out of prison. Her disgust grew once Tritannus achieved his demon form not to mention how Icy throws herself onto the guy. She is also beginning to show deep resentment to Icy ever since they teamed up with Tritannus, not liking the person she is becoming.
Darcy plants a curse on Tecna's phone. Darcy and her sisters go to Graynor to battle the Winx but they lose to the Rainbow Mantle. The Trix go to Gardenia to get more pollution for Tritannus but they lose to the Winx's new Harmonix powers.
Tritannus later grants Daphnes Sirenix powers to her and her sisters and they enter the Infinite Ocean. After that, Darcy and Stormy starts feeling like Icy and Tritannus doesnt even notice them (which ironically is correct) so instead of helping them to get seals from Pillars of Infinite Ocean, they decide to attack Melody and the posses the Singing Whales, which helps Tritannus and Icy to escape the Winx with seal from Pillar of Balance. Darcy tries to convince Icy to leave Tritannus, which she refuses to do. Knowing that she and Stormy failed to get respection from either Tritannus nor Icy, she grows bigger dislike of Tritannus and plans to double-cross him to get Icy back. When Winx destroy the final seal, Darcy believes that Tritannus has failed them (like Darkar and Valtor) so she and Stormy leaves him and Icy behind. Later when Icy tries to steal Sirenix powers from Politea, Darcy and Stormy steals them instead right in front of her nose and escapes. Darcy and Stormy appears just in time to protect Icy from Tritannus, who is possessed by Thrones powers. Tritannus uses his powers to send all three of them away, leaving their current fate and location unknown.
Against Sora's TeamEdit
After meeting Maleficent, and her battle with Bloom and Sora, Darcy and her sisters wanted revenge on them and gained new powers by Maleficent. When the team goes on missions, she starts fighting with Sora.