Malefor

King Malefor, also known as the Undead Dragon King, is the ruler of the Underworld. He is shown to be good friends with Portal Master Porky, though Porky doesn't seem to respect him that much, calling him a "slug of a dragon."

History
Not much is known about Malefor's past, but it is known that he was born a purple dragon of prophecy in Pyrrhia. He is the third purple dragon of prophecy. Malefor was born into slavery and abuse, and as he got older, the rage inside of him built up more and more, before he finally snapped. One night, Malefor ran away from home, and left Pyrrhia for the Underworld, in which he became an ally of the undead, and eventually became the ruler of the realm.

In order to gain revenge for the painful childhood his parents gave him as a dragonet, Malefor sent his undead forces to Pyrrhia in order to steal an egg from the Year of the Dragon celebration. The forces returned with a dark blue egg, which hatched the future Skylander Cynder. Malefor raised Cynder as his own daughter and corrupted her with the powers of the undead. Cynder terrorized Skylands for years, until she was defeated in battle with Spyro Duskshine, and returned to her normal state. Cynder then became a Skylander, enraging Malefor, who to this day still attempts to have Cynder join his side again.

Malefor tried several times to capture the Undead Skylander Hex and unlock the secrets of her Undead powers so Malefor could be even stronger. But, Hex fought Malefor and battled him, leaving the dragon defeated and terribly wounded. The truth was, that Hex only won the battle by luck.

Personality
Not much is known about his personality, but he is surely cruel, cold, and greedy. However, it is said that when he was a younger dragon, his personality was similar to that of Spyro, he was kind and was always willing to help others.

Skylanders: Lost Heroes
Malefor appeared in the 3DS/PSVita version of Skylanders: Lost Heroes. According to the story, he had tried to destroy Skylands but got defeated by the Lost Skylanders in the past, Malefor had banished the Lost Skylanders after he was defeated. When Malefor returned, the Lost Skylanders returned, and so they and the other Skylanders defeated Malefor once again.

Skylanders Super Force
Malefor is the main bad guy in console version of Skylanders Super Force. He once ruled Skylands, then the Super Force Skylanders stopped him. Then he dissapeared into the Underworld, and bansished the Super Force Earth. Then both of them returned, and the Super Force must stop him. He wants to get all super crystals.

The War of Skylands
Malefor is the main bad guy. He made the Hypno attacker to hypnotize Skylanders, but Shockclopse, and other none effected Skylanders try to stop him. Then he sent one of his hypnotized Skylanders to kiddnap Ultimate Chimera. Then Shockclopse,  and the others came to save him. Then Malefor fights Shockclopse, then Spyro, and Shockclopse fused to Scupeon to face him.

Trivia

 * His color scheme is similar to that of Ridley.