Selina/Series

Pre-Series
As a young child, Selina befriended Bloom and the two often played together in the Forest of Flowers. There, Eldora saw the two girls and noticed the magical potential within Selina, prompting her to become the child's Fairy Godmother.

As she continued on in school with Bloom, Selina learned how to use basic magic from Eldora and she was also instilled with good morals during most of their lessons. At some point, Eldora became the Keeper of the Library of Alexandria in Egypt, and had Selina accompany her to the ancient library when she thought the young teen was ready. There, the two fairies came across the Legendarium. This marked Selina's first instance of witnessing the Legendarium's true powers, as Eldora had accidentally summoned the Hawk Spirit from within its pages when she read its legend aloud.

After barely managing to defeat the Hawk Spirit by turning it into a pig mid-panic, Eldora sealed the book away in her home as she traveled the world searching for a way to permanently seal it closed. With Eldora away, Selina took it upon herself to watch over the book, during which Acheron, an evil wizard responsible for creating the Legendarium, spoke to Selina from his page in the book.

Selina found herself swayed by Acheron's promises of power, even more so once the dark wizard bestowed her with dark magic and dubbed her as the "Witch of Snakes." In that moment however, Eldora returned home and caught Selina with the Legendarium in her hands. Fearful of what the book could have done, Eldora took it from Selina and locked it away within a protective barrier.

Unfortunately, Selina had made her choice and, on the night of a full moon, the young teen snuck into Eldora's home, released the barrier over the book, and fled the Forest of Flowers with the Legendarium in hand.

Season 6
In "The Legendarium," Selina is part of a group of witches hoping to attend Cloud Tower. When asked by Headmistress Griffin to explain her powers, it is shown that she has the ability to bring myths to life using the Legendarium. She summons the Gloomy Wood Trolls to attack Pixie Village. After ending the chaos she summoned, the Trix appear and take over Cloud Tower and turn Griffin into a crow. They see great potential and use in Selina's powers, so they make a deal with Selina. She helps them conquer all of the Magic Dimension's colleges and in return, they will teach her all the spells they know.

As Cloud Tower hovers over Linphea College, the Trix tell Selina to bring Linphea's legends back to life. Selina summons the legendary Treants who attack the college and its individuals, including the Winx and Specialists. The Winx realize that the source of the Treants' magic is coming from Cloud Tower, so they break in and fight the Trix. Selina decides to protect the Legendarium at all costs and uses the Legendarium to form a bubble of energy around her, the Winx then realize that she has the source. They try to attack her instead of the Trix. However, Selina's shield takes the Winx's (minus Bloom) magical abilities away and teleport all the Winx outside of Cloud Tower where they fall until the Specialists catch them.

After the Treants fail to take over Linphea College, Selina summons the Flying Basilisks. However, they are defeated. It is revealed that Selina is, in fact, working under the orders of a mysterious dark being housed inside the Legendarium, so it is possible that she and he have their own agendas that differ from the Trix. Selina then summons the Pandemonium Sprites, which attack the Golden Auditorium, although later Musa and Tecna defeat them.

While mummies and the Sphinx attack in Egypt, Selina heads to the Lost Library to find Eldora's Diary and ensure its destruction since it contained information on how to permanently seal the Legendarium. She was surprised at the sudden appearance of Bloom, her childhood friend, as well as her status as a Fairy. Selina uses Bloom's naivete about her true alignment to infiltrate the Winx in order to discretely take them out.

In the "Shrine Of The Green Dragon", Selina mutters to herself she needs more power to free Acheron before getting called upon to use the Legendarium. She uses it to summon green dragons to invade China.

Back at the Great Wall, the dragons come down upon the Winx. They quickly transform to fight them off. Daphne tells Bloom that frontal attacks won't work on the dragons due to their speed, so she has Flora and Aisha set up some traps to slow them down. They managed to ensnare two of the dragons, then Lu Wei flies in riding a magenta dragon trying to fend off the remaining one. He noticed something odd about their collars before getting knocked off. He is saved by the Pixies. The trapped dragons break free and they all attack Lu Wei's dragon. Lu Wei tells the girls the dragons are uncontrollable unless they are fitted with the Pearls of Restraint, and they can be found in the nearby mountain. The Winx had no choice but to go to the mountain cave and find them to stop the dragons. A dragon attacks Musa and Tecna, then Musa finds a pearl and lodged it into the dragon's collar. Stella takes another dragon for a ride before getting a pearl placed on it by Aisha. Daphne finds the last pearl, but gets knocked out of the air by the last dragon and Bloom quickly flies down to grab the pearl before finally placing it on the dragon. The three dragons immediately become tame, and Lu Wei expresses his gratitude.

In "The Secret Greenhouse", Selina shows up at Alfea to the surprise of Bloom, who enquires what she was doing in Egypt. Selina replies that she too had been searching for Eldora, who was her Fairy Godmother. She added that while in Egypt, the Trix had tried to kidnap her, hiding that she was, in fact, working for them. Sky is suspicious of her as he feels something was not right about her. When the Winx and Selina go to the abandoned greenhouse, Selina states that she does not recognize the flower held by Flora. Later, while the Winx were distracted by the beauty of the greenhouse, she curses a batch of flowers which causes Flora to become unconscious. When Bloom and herself ran off to the Potions Lab in Alfea to try to brew a potion to cure Flora, she turns a couple of regular magical plants into monsters to attack Aisha, Stella, Musa and Tecna who were trying to protect Flora. Their Bloomix powers prove to be quite ineffective against the monster plants. Meanwhile, Selina brews a fatal poison in the Potions Lab while Bloom fends off a monster plant which crashed into the Potions Lab. When Bloom flies off to get to Flora, Selina reverts the monster to its original form.The Trix who were observing her cackle with glee, with Stormy stating that they were the best role models ever and Icy commending Selina. In the Alfea infirmary, Griffin frantically explains to Faragonda and Sky that Selina was working for the Trix, confirming his suspicions. They arrive just in time to stop Bloom from poisoning Flora, and later tell her about Selina's true colors. Horrified at what she had almost done by trusting Selina, Bloom leaves Alfea to go back to Gardenia.

In "Broken Dreams", Selina secretly contacts Acheron once more in Griffin's office. He warns her that if the Winx are not stopped they will eventually be meeting Eldora. However, the Trix suddenly get into the office and interrupt, causing Selina to close the Legendarium. The Trix use the crystal ball to see what Bloom was doing, mocking her upon the sight of her on the ball. Selina uses the Legendarium to summon the Children of the Night to take over Gardenia and eliminate Bloom, later commanding them to attack Bloom's home under the request of the Trix. On the other hand, Bloom remembers as the two were friends and, seeing a drawing they had done, wonders why this against her. With the drawing she is able to discover Eldora's location, knowing that she also lives there. Then by order of the Trix, Selina ordered the vampires to surround Bloom's house and catch her, but they are defeated by the Winx. Later the vampires are eliminated with Stella's light, because the Winx were their hostages. Selina promises to the Trix (enraged by the defeat) that something good will be used to defeat the Winx.

The Trix are observing the Winx and see them going where Eldora lives. The Winx meet Eldora, who explains her past connection with Selina. The Trix leave to go attack Eldora's house and there is a battle between the Winx and the Trix. Selina then summons ghosts that the Winx are unable to fight until Eldora steps in and destroys the ghosts, and the Trix retreat. The Winx ask Eldora to help beat the Trix and save Selina from Acheron's evil influence. She accepts and comes out of retirement.

In "Mythix", Eldora tells the Winx that they must obtain Mythix. They go to Tir Na Nog to see Queen Nebula who shows to the Winx the Mythix scepters that can only be used by proving themselves worthy of their power. The Trix reject Selina's demand to have her powers enhanced, and they go to Tir Na Nog to battle the Winx. Selina goes to Tir Na Nog and absorbs part of Bloom's Dragon Flame in order to free Acheron before being overpowered by Bloom.

In "Mystery of Calavera", Selina secretly contacts Acheron once more in Griffin's office and tells that the Trix refuse to share any of their power making it difficult to release him. Selina sends the Trix into the Legendarium to destroy the Winx and also to get rid of them, so that she could free Acheron.