Pre-Series
As revealed in Darko the Black, Darcy and her sisters, Icy and Stormy, hail from a realm known as the Ice Kingdom where they spent a majority of their childhood, during which, they befriended Darko, the only son of the powerful First Counselor Mazakis of the Kingdom's Royal Court.
Darcy often played with Darko alongside her sisters to the point of becoming his regular playmates and it was during this time that Darcy developed a bit of a crush on the young boy, unaware of his fondness for her elder sister.
Eventually, Darcy and her sisters left for Magix in pursuit of their dream of becoming powerful witches; the first step of which involved attending the Cloud Tower School for Witches.
Series
Season 1

Darcy makes her debut halfway into The Castle alongside her sisters, Icy and Stormy, waiting for Knut in an alleyway. She is pleased to see him arrive with Stella's sceptre in hand, only for their meeting to be interrupted by Bloom demanding that they return it to its rightful owner. Darcy and her sisters then attack Bloom, finding it foolish that she would take on three senior witches by herself and laughs when Bloom tries to use her magic in retaliation.
Things suddenly take an unexpected turn however when, as her sisters hold back Bloom's friends, Bloom emerges from Icy's ice transformed, prompting the Trix to retreat without the sceptre now that too many eyes were on them. This confrontation with the Winx soon leads them and the Trix to clash almost constantly throughout their school year; mainly boiling down to the Trix trying to sabotage an event, take advantage of group tensions between the girls or strike when one of them is alone all to get their hands on Stella's ring, only for the Winx (mainly Bloom) to foil their plans and leave them humiliated.
Instances of these are shown in Issue 2, where the Trix try to sabotage the Traditional Meeting Dance between the Alfea Fairies and Red Fountain Specialists, only to thwarted by Bloom, as well as Issue 3, where their plans to have the trolls corner Stella and Prince Sky so that they could steal her sceptre go awry when Bloom and Sky's squire, Brandon come by. Both of these instances were foiled purely by chance.

Come Issue 5 and the Trix are scolded and punished by Headmistress Griffin for their constant failures; mainly after their plans to sabotage the Traditional Meeting Dance had failed and blew up in their face. As punishment, the Trix are made to polish the highest spires of Cloud Tower, with Darcy left to clean the roofs as her sisters stay to hold the ladder down.
Things quickly go awry when Icy and Stormy do more complaining than working, leaving the ladder without support, which causes it to fall over as Darcy is left hanging onto a bent piece of the spire's roof for dear life. Luckily, just as she loses her grip, Stormy "eases" her landing with a gust of wind, which also ends up picking up a familiar scent from Gloomy Wood Forest.

When the Trix take it upon themselves to investigate the source of the scent, the three come across a now-frightened Bloom and decide to take their chance at vengeance now that they have it. For her part of the spell, Darcy turns Bloom's body into a cloud of smoke to ensure that no one ever find her after Stormy had masked her scent. Once Icy traps Bloom's smoke body inside a nearby tree, Darcy taunts Bloom with her sisters by telling her that now she has plenty of time to do some self-reflection as no one will come to save her this time.
Darcy appears again in Issue 6 foraging for potion ingredients in the Black Mud Swamp with her sisters. Darcy quickly gets into a trivial argument with Stormy until they hear footsteps that seem to be heading in their direction, so the sisterly trio rush for nearby cover to hide and see who the footsteps belong to. It does not take long for the Specialists to appear from the thicket across from the Trix's hiding place and, upon remembering how the Specialists favor Alfea Fairies to Cloud Tower Witches, Icy gets the idea to charm them into forming an interest in them.
Unsure as to where Icy's plan is exactly headed, Darcy simply follows Icy and watches on confused as Icy fakes having a sprained ankle. Her confusion quickly turns into annoyance as she sees how quickly the Specialists directed all their attention to Icy, leading into another bout of squabbling with Stormy.

Eventually, Darcy approaches Riven, who had been standoffish the entire time, and asks him about it. When Riven claims that witches can just make easy cures for something as minor as a sprained ankle, Darcy goes on to explain how a witch's magic is made to solve completely different types of pain, such as the pain of not being loved or the pain of being left unappreciated despite one's true worth. Though he tries to maintain distance, Riven becomes enticed by Darcy's words, and tries to inquire more of how she can fix such a thing with her magic while Darcy leaves him hanging at every corner, making him more curious and desperate as she draws him closer.
However, the two are interrupted once they discover the skeletal remains of a saurodont, which prompts the Specialists into action. Before they can leave, Stormy demands that they not get left alone, which Riven uses as his chance to stay behind and learn more of how Darcy can help his plight, with Darcy being quick to catching onto his intentions. Before Darcy gets her chance to lure Riven in again, the Specialists catch sight of the Winx and a swamp monster that emerges from the river separating the two groups to attack them, leaving Darcy and her sisters completely ignored as Riven's desire to fight takes priority in his mind. She then watches on as Icy has Stormy create a raging storm fueled by Riven's energy to aid the swamp monster until Riven begins collapsing.
Once Riven stops showing signs of movement, Darcy demands for Icy and Stormy to stop before he dies and drops to his side to tend to him as she tells her sisters that they used too much of his energy. She becomes oddly defensive of Riven when Icy calls him a "silly boy" and insists that they could use Riven as an ally instead of wasting his potential with a one-off storm. She then decides to stay by Riven's side as her sisters leave before being seen by any of the Winx.

Once Riven regains consciousness, Darcy claims that he was knocked out by a bolt of lightning that struck the ground near them and helps him out of the swamp, completely unaware that Musa had been watching them from behind a nearby bush, becoming increasingly anxious at how close the two seemed to be.
The following issue opens up with the Trix bored in class as their professor, Bittersmoke, tries to teach his class in vain. When Bittersmoke makes mention of some forbidden books that catch Icy's interests, Darcy simply claims to have not heard anything and resumes staring off into space.
After class, Icy tells her sisters of the forbidden books and her plan to use whatever is inside them to rule all of Magix on her own. Darcy catches this and reminds Icy that they all promised to rule Magix together, but Icy just continues bragging and Stormy wonders if one of the books contains a clue to the Dragon's Flame: the source of all magical energy that remained lost for centuries.

And so, later that night, Darcy and Stormy follow Icy as she explains how her plan will work. Eventually, the time comes where Bittersmoke begins sleepwalking, prompting the Trix to follow him to the chamber where the forbidden books are held. Once Bittersmoke leaves what seems to be a dead end, the Trix figure out how to activate the secret passage and arrive at a crypt underneath the library where all the forbidden books have been hidden away.
Inside the store room of forbidden books, Icy comes across a tome bound by iron and learns after many failed attempts that it is locked by an ancient spell. After more failed attempts, the Trix take the tome up to their dorm before they are caught to properly figure out how to open it. As Icy tries to figure out what the riddle could mean, Darcy simply starts dozing off until Icy starts attacking her and Stormy in an attempt to trigger the "true pain" needed to unlock the tome, leading to her and Stormy retaliating until a classmate comes by demanding that they stop all the racket.
Once they have all calmed down, Darcy and Stormy try to collect themselves as Icy realizes what "true pain" will be needed to open the tome.
The next day, after Knut returns from Alfea, the Trix begin their plans for harvesting Stella's pain.

A few days later, once Stella arrives by the bazaar as planned, Darcy uses her powers of deception to create the image of Stella's parents arguing, which causes Stella to unlock the forbidden book once her "parents" begin blaming Stella as the cause of all their heartache.
Darcy is not seen again until after Bloom forces the book closed and leaves with Stella, as the Trix are now left wondering how she could have achieved such a feat. Unsure of the extent of Bloom's strength, Darcy proposes that they find out more about her as she and her sisters set their sights on what could be inside Bloom's heart, rather than Stella's sceptre.

In the beginning of Issue 8, Darcy appears in Musa's nightmare after she failed to catch up to Riven who was running away from her cloaked in a hood. As Musa questions why she is here and what she could have done to Riven, Darcy pushes her over the edge of the cliff behind her, leaving her to fall to her death until she springs awake at the sound of someone pounding on something.
Darcy does not appear again until two issues later in The Revelation trying to listen to an announcement Headmistress Griffin had gathered them for. After learning of an organized competition with the fairies of Alfea, she and Stormy follow Icy's plans to use a spell that will help them discern which fairy wields the Dragon's Flame. The witch trio spend that night preparing the formula necessary to their plans but seem to be making little progress as Icy keeps mispronouncing the chant.
Darcy demands to switch places with Stormy, believing that the steam emanating from their cauldron is going to mess up her hair, and bickers with her until Icy makes another mistake that causes the cauldron to shake until a monster emerges from within it.

Darcy then complains over how Icy called forth the wrong monster and did so too soon until Icy has her and Stormy join their powers against the monster to cancel it out. Unfortunately for them, however, the monster simply absorbs their powers, growing in size as it busts through a nearby wall to wreak havoc in the school.
The Trix try to tail the monster as quietly as they can until Polly, a fellow classmate of theirs, tells Griffin that they were the ones who summoned the monster she identified to be too advanced for any of the witches in the school. Darcy simply tries to play innocent with Stormy as Icy explains how they were simply practicing for their test with the fairies. She, Stormy and Icy then rush to hide behind a pillar to follow the professors after Icy explains to Griffin that their efforts to stop the monster were in vain. She and Stormy watch on in horror as they witness the monster absorb all the professors' magical energies and double in size before leaping out from Cloud Tower in the direction of Lake Roccaluce.
The Trix continue to follow the monster until it reaches Alfea, where it is defeated through Bloom's power as she is the only one left who can resist the monster's ability to absorb magic. Having seen enough, the Trix return to Cloud Tower to prepare for another scolding from Griffin but, now that they know where to look for the Dragon's Flame, keep their heads held high as they prepare their next move.
By Dragon's Flame, the Trix had already ambushed Bloom in her home on Earth and seized the titular power that resided in her. By the time news of this reaches the Winx, the Trix had already taken over Cloud Tower as their base of operations and sent out an ultimatum: that all of Magix give in to their demands.

While the Winx were busy braving the frozen wasteland of Domino, Darcy and her sisters used sparks of the stolen Dragon Flame to summon up the Army of Darkness and sent them out to ravage Magix. By the time the Winx are rescued by the Specialists, Red Fountain had been completely destroyed in an attack.
Darcy is seen later with Stormy laughing at Riven, whom Darcy discarded after she and her sisters acquired the Dragon Flame, as he berates himself for being so foolish. They then leave him to rot in his cell to meet with Icy to continue waging war on Magix, leading into the next issue, Magic Battle, which centers around the climax of the Trix's conquest.
After sending out yet another wave of their Army, Darcy and her sisters watch everything unfold from Griffin's Magic Eye as they await Bloom and her companions, fully aware of her plans to take back the Dragon Flame.

They ambush Bloom just before she is able to get her hands on the Dragon Flame that they had purposely set for her to lure her and her friends but, just before Darcy and her sisters can destroy the last leg of their opposition, they are blasted down from behind by none other than Griffin, who had broken out of her prison alongside the rest of the Cloud Tower students.
The Trix are then trapped behind a sheet of crystal and boulders as Griffin evacuates everyone to regroup at Alfea but, thanks to their enhanced strength drawn from the Dragon Flame, they easily break free from Griffin's barrier and command the portion of their Army stationed at Cloud Tower to pursue them.
Darcy later appears alongside her sisters overlooking the final attack launched at Alfea. She then commands a wave of their aerial forces to attack as their "instruments of victory," and launches a conjoined attack with Icy and Stormy onto Faragonda and Griffin for trying to erect a barrier around the school.

Soon enough, however, the Trix face a major wrinkle in their plans when Bloom returns to Alfea having somehow regained the powers they stole, so Darcy is made to take care of Bloom's friends with Stormy as Icy, overcome by rage, decides to take down Bloom herself. Unfortunately, when the two sisters combine their powers against the Winx, their attack is reflected back at them by Tecna, which leads to their defeat at the hands of Faragonda and Griffin, who trap Darcy and Stormy inside a heavy spiked ball.
Darcy is not seen again until the very end of the issue, where she and her sisters are being hauled off to the Fortress of Light by two of its templars as penance for their crimes against all of Magix.
Season 2
Darcy is first seen in Monster on the Loose in a picture book created by the pixies to retell the recent events to the Traveling Pixie during her visit.

Since he was restarting his search for the Ultimate Power, Lord Darkar, the Shadow Phoenix, busted into the Fortress of Light with the intent of breaking the Trix free from what was supposed to be their rehabilitation.
Ecstatic at their newly regained freedom, Darcy and her sisters accepted Darkar's terms and were rewarded the power of Gloomix, which they used to break out of the Fortress and head to Darkar's Fortress. From there, the witch trio waited for the Winx to come across Darkar's Fortress and, though they were unable to defeat the Winx thanks to their combined strength with the Specialists and their new friend, they damaged the group enough to force them all into retreating.
The Trix went on to steal the quadrants of the Codex from Magix's three schools and Pixie Village while Darkar's spy kept those at Alfea distracted long enough by impersonating the incoming Professor Adonis. By the time everyone learned of the Trix's work, the witch trio had already stolen Red Fountain and Cloud Tower's quadrants of the Codex.
Despite all their efforts though, the Trix, along with Darkar, were defeated and presumably perished as Darkar's Fortress crumbled. That is until the following issue, An Evil Wind, where it is revealed that the Trix managed to survive the cave-in and have been living within the rubble as wanted fugitives. Darcy ended up being the most unlucky out of the three thanks to having sustained a broken right leg that leaves her stuck lying around and barely able to move.

Much like her sisters, Darcy detests having to live like hermits in a cave, and voices her displeasures when Stormy proposes they continue on with their newfound lifestyle since no one in the whole Magix is aware of their survival. Despite this, she still remains uneasy as Icy devises a plan to make everyone forget of their past crimes, most likely fearing the possibility of capture, but, a few days later, she can be seen aiding both Icy and Stormy in their attempt at sneaking into Cloud Tower for the ingredients they need, even with her injured leg once it had healed enough to allow for her to walk.
Due to her limited mobility, Darcy is left to stake out the school's entrance, keeping watch over the two freshman witches who were running late as Icy and Stormy impersonate them to sneak inside after Icy knocks them unconscious.

An hour later, Darcy begins to make her way for the edge of the forest she and her sisters originally came from once the two witches before the two witches can fully regain consciousness. With Icy and Stormy still nowhere in sight, she hopes to herself that they were able to get what they needed to, and her hopes are answered when she catches sight of her sisters flying in her direction in a hot-air balloon carried by Stormy's winds.
Once Darcy is aboard, the three witches fly off in the direction of the mountains as Icy goes over the next phase of her plan, starting off with how she will need Stormy to conjure up a pleasant breeze to ensure nobody catches onto their plans.

Darcy does not appear again until the tail end of the issue, right as the meddlesome Winx Club and their bonded pixie uncover their mountainlair, as well as the contraption behind their "evil wind." The witch trio combat the six fairies to keep them from destroying their contraption, but are unable to deal with both them and the pixies. This leads to a stray ice blast knocking over the large vat of memory-erasing potion that was fueling their evil wind, causing the Trix to get caught up in the potion as it is spilled out and washes them away.
Having faced defeat yet again, the Trix are taken to Alfea, where it is revealed that the trio had completely lost their memories due to coming in direct contact with their highly potent memory-erasing potion, and since they ingested so much of it, their memory loss is declared permanent. Since none of them can remember the crimes they had committed, much less their own names, Darcy and her sisters are reinstated into Cloud Tower, as Griffin intends on teaching them on how to become responsible witches with good wills. Additionally, everyone is forbidden from so much as making mention of the Trix's past crimes, on the off-chance that doing so could trigger the trio's memories.
And so, the Trix live out their lives as Cloud Tower Witches where, three issues later, they go on to attend a big party being held at Alfea for all three of Magix's major schools.

Here, it becomes apparent that no one is truly happy with the new arrangement after the Evil Wind fiasco, as everyone who sees the Trix arriving reacts with varying degrees of shock, fear or disgust. Darcy and Stormy find the attention to be strange, but brush it off for the chance to tease Icy once she claims that the reason everyone is staring is because of her being the most beautiful witch in the whole of Magix.
Eventually, though, the three witches begin to get angry at how no one, especially none of the guys, are taking the chance to sit with them. Darcy has also noticed how a nearby group of fairies has been sneaking nasty glances at them while talking, but does not understand why Icy seems to find the redheaded fairy to be such a hateful person.
Shortly afterwards, Darcy and her sisters find enjoyment in the party again once a band called the New Magix Sound begins performing, but, while she and Stormy seem to be fine with dancing at their table, Icy makes them come with her to meet the boys so that the three of them can score themselves some "high-class boyfriends" as she believes they deserve. So, by the end of the performance, the Trix have already made their way to the stage and stop the boys just before they are able to leave.
Though Icy is the one who does all the talking, it is pretty clear that both Darcy and Stormy expect some kind of arrangement out of this, however, the three witches find themselves utterly humiliated when the same group of fairies who were gossiping about them step in and assert themselves with all three boys being spoken for. Enraged, the Trix return to their table but, after having to deal with everyone else at the party laughing at them for being rejected, decide to return to Cloud Tower altogether.
- Issue 24: Love Potion
- Issue 26: The Seed of Disagreement
- Issue 27: Darko the Black
- Issue 28: Witch Love
- Issue 29: Magic Tournament
- Issue 31: The Return of Princess Diaspro
Season 3
- Issue 35: The Trial
- Issue 36: New Challenges
- Issue 38: Musa's Enterprise
- Issue 41: Love Beach
- Issue 43: Lost Words
- Issue 48: The Knights of the Star
- Issue 49: Love Betrayed
- Issue 52: Infernal Concoction
- Issue 54: Pandora's Box
- Issue 58: The Magic Child
- Issue 59: Winx Band
Season 4
- Issue 56: Magix on Ice
- Issue 60: Future Adventures
- Issue 64: Magic Holiday
- Issue 67: Magix Virus
- Issue 68: Roxy the Seventh Fairy
- Issue 69: The Cursed Jewel
- Issue 70: Ski Break
- Issue 82: Forbidden Magic
- Issue 96: Fairy for a Day
- Issue 100: The Stone of Memories
Season 5

In Issue 115: The Last Dragon of Pyros she disguises herself as an apprentice sorceress named Cadyr. It was part of the Trix's plan to steal baby Flame dragons' great magical powers. Darcy as Cadyr begins training under the sorceress Maia in order to hone her fire magic on Pyros. She pretends to be horrible at fire magic, such burning herself constantly, and shows discouragement but Maia assures her that she just needs more time. The two sorceresses then trek to the top of Dragon's Peak, the tallest mountain on Pyros, so that "Cadyr" may hone her skills.

When the two make it to the top of Dragon's Peak, they come across a nest full of baby Flames, and "Cadyr" proposes that they absorb the babies' powers in order to strengthen themselves. Maia tries to talk "Cadyr" out of such a decision, warning her that the baby Flames would die if they did so, but "Cadyr" does not listen and attacks Maia. She then traps the baby Flames in a cage made of dark energy but, when one slips away, she lets it escape, believing that it would be unable to do anything to stop her.

"Cadyr" does not appear again until Bloom, Stella, Tecna and the baby Flame arrive to save Maia. She traps the three fairies in a ring of dark energy and, with them unable to escape, she admits that she was not expecting for the Winx to show up. Just as the Winx demand to know what "Cadyr" has done, Icy and Stormy appear from behind her. "Cadyr" then explains that the Flames hold an innate magical power that will soon belong to the Trix and removes her disguise.
With their enemies trapped in her dark energy cage, she and her sisters drain the baby dragons' powers. Because she is distracted, she does not realize that the escaped baby dragon had released her enemies. Darcy is then attacked by Bloom. Darcy then tries to ambush Bloom after the fairy had freed Maia but her sneak attack failed when the old sorceress noticed. Darcy is overpowered by the two joining their powers against which prompts Icy to scold her for her incompetence. However, Stormy notices the sky getting darker and its the Mother Flame Dragon. The enraged mother breathes fire at her and the sisters. Darcy and Stormy flee leaving Icy behind.
Season 6
- Issue 120: The Enchanted Forest
- Issue 122: The Great Challenge
- Issue 123: The Spell of Time
- Issue 124: Attack of the Centaurs
- Issue 126: The Magic Exhibition
- Issue 128: The Rainbow Mountain
- Issue 132: The Fire of the Phoenix