He is the ruler of an underground castle and is an ancient deity of pureness darkness since the dawn of time. He is the polar opposite of the Dragon Flame, and almost equally as powerful. While the Great Dragon is a source of light, life and energy, Lord Darkar absorbs it, thus creating an opposite essence of the Dragon Flame and is a source of negative energy, making him do bad deed.
In the original RAI version, he is described as being an ancient creature which was born from the original void from before the beginning of the Universe. It is also stated that he was the master of the Ancestral Witches and Valtor and was the one, who initially sent them to seek the Dragon's Flame from Domino, therefore being the cause of its destruction. When the Witches were defeated by the Company of Light, the Lord of the Templars of the Fortress of Light fought Darkar himself, cast him back into the darkness, and sent him into a deep slumber for sixteen years, until he woke up again, possibly caused by the return of Bloom's Dragon Flame in the Magic Dimension after she used it to defeat the Trix in the first season, since his power is opposite to that of the Dragon's.
The difference between Lord Darkar's power and that of the Water Stars which also oppose the power of the Dragon is that, while Lord Darkar's power absorbs energy and the Dragon's power generates energy and with respect to each other, the former is Evil and the latter is Good, both the Dragon Flame and the Water Stars generate energy, but the energy released by each respectively is of opposing nature and neutral, none being Evil or Good with respect to each other.
Since it has been stated in the series that the Ancestresses were under the orders of Lord Darkar when they destroyed Domino, it also means that Valtor was also serving him at this time. This means that Lord Darkar already had someone with the Dragon Flame serving him, and the only explanation that can be given to his causing the destruction of Domino is that Valtor's Dragon Flame was the Dark part of the flame which was created when a spark from the Dragon's fiery breath had mixed with the Darkness (possibly itself having being created from Lord Darkar's power, since it was stated that both Lord Darkar and the Great dragon were born at the beginning of Time from the Void), and therefore was halfway between the powers of Light and those of Darkness. Darkar needed a power which was the complete opposite to his own power to create a balance between Light and Darkness in order to summon and acquire the Ultimate Power from the Realm of Realix, and the pure Dragon Fire of the Royal Family of Domino was what he needed.
It can also be supposed that Mandragora was also serving Darkar, since she was herself the servant of the Ancestresses who were themselves Darkar's servants. Moreover, from the reactions of members of the Company of Light in the first movie it can be guessed that they had already fought Mandragora when the Company had recently been formed, around the time of the destruction of Domino and hence that she had probably taken part in the destruction of Domino , which was done under Darkar's orders.
Darkar is therefore the ultimate cause of most of the events taking place in the first 3 Seasons and the 2 Movies and, indirectly, the events in Season 4 since the Winx came to after the Wizards attacked Bloom thinking, that she was the last Earth Fairy, having sensed her Fairy energy in Gardenia, where she had been sent when Domino was destroyed.
Darkar looks glowing red and wears armor over his seemingly body. He also has torn, red glowing fabric on the back of him. It is not possible to see his eyes during the show but they occasionally glow like fire with small pupils or they momentarily lightens with a red spark.
Story in Winx ClubEdit
In Season 2, he planned to obtain the Ultimate Power of the Realix. However, the portal to the Realix realm can only be opened by the four pieces of the Codex. (There is one in each of the schools (Red Fountain, Alfea, Cloud Tower and in the Pixie Village.) He held the pixies hostage to get them to reveal the location of the Pixie Village, but they refused. The princess of Andros, Layla, despite her best efforts, could not save them. She then got the Winx Club's help when they rescued her. Unfortunately, Darkar also got help from the Trix. He did this by releasing the Trix from The Fortress of Light (Roccaluce) to assist him in his quest and gave them Gloomix power.
After he obtained two of the four pieces, he made the false Avalon that he had sent to Alfea to put a shadow virus on Bloom to turn her into Dark Bloom. Darkar then used her as his puppet to get the Alfea's part of the Codex. He obtained the final piece of the Codex when he sent Icy after Livy to get Pixie Village's part of the Codex. Icy succeeded with the help of her two sisters: Darcy and Stormy.
He then ordered Avalon's shadow clone to abduct Bloom and when she was in his castle, he cast the Shadow Spell on Bloom again and used her and her Dragon Flame, since he needed a power of Light to counter his power of Darkness, to open the Portal to Realix. But when the Trix confronted him, saying they did all the work, he told them that they had only been his pawns and were now useless to him and sent them to the Dark Void: Oblivion. He almost succeeded in gaining the Ultimate Power of Realix, but as he was absorbing the power, Sky told Bloom that he loved her and the love for him in her heart caused her to use her healing power on herself and the others and broke the Shadow Spell as well as destroying the Power. The Trix, fused into one body, tapping into their Gloomix, took on Darkar, but were knocked out. All six of the Winx members used a Charmix Convergence to defeat Darkar, and, according to Miss Faragonda, destroyed him - they sent him to the dark realm from which he came from in the 4Kids Version. The Trix (still fused into one body) remained imprisoned in Realix, which was then apparently sealed for good since the Codex and its copy had been used and no other Codex has been shown to exist, till they were sent to the Omega Dimension some weeks later (it is not known how the authorities of the Magic Dimension were able to go to Realix to catch the Trix since the only known pieces of the Codex had all been used). His Castle collapsed after he was destroyed, probably because it was his Evil powers which were maintained in it.
It can, however, be questioned whether Lord Darkar is really dead or not since, in Up To Their Old Trix, Professor Wizgiz said that everything needs to have an equal opposite to continue existing and to maintain the balance of the Universe, and that a power's opposite is automatically created along with itself. This means that the Shadow Phoenix and the Great Dragon were born at the same time and that they also need each other to counter each other's powers and maintain the balance of the Universe. It could be that Lord Darkar is still alive, imprisoned in the Realix Dimension, or it could also be that he effectively died, but that his power or his essence still exists, but in a disembodied form, maintaining the balance of the Magic Dimension by countering the power of the Dragon Fire (similar to the Great Dragon: while the Dragon itself no longer exists, its power still exists in the disembodied form of the Dragon Flame which has been passed down through generations of the Royal Family of Domino).
Winx Club: The Shadow PhoenixEdit
Darkar is called the Shadow Phoenix and appears in Alfea under disguised as Professor Avalon.
Against Sora's TeamEdit
When Maleficent brought Lord Darkar to life, he refused to work for her and began to roam freely to other worlds thanks to her. When he first met the team, he fought against Riku but lost and realized that the Keyblade can stop him and tried to set the team and The Winx up by having a feud, but when Kairi points out of their enemies, they stopped and attacked Lord Darkar. Now he holds a grudge against Kairi and Riku.