This is Darkar, the bad-guy who spices up Season 2 by trying to take over the magical universe. This guy, also known as the Shadow Phoenix can transform not only in a phoenix, but also a huge cobra - and of course, his signature skeletal-knight-look.
Meet Valtor, the villain of season 3 who, like Darkar, has a passion for power and is willing to do whatever it takes to get control of the magical dimension. He's a cunning wizard with powers both magical and manipulative, being a step-up from Darkar, it's takes some major Winx-power to take him down!
The Wizards of the Black Circle
From left to right, Anagan, Ogron, Gantlos and Anagan - the Wizards of the Black Circle are a band of powerful wizards from the past, who want nothing better than to gain revenge on the faeries of Magix.