Shuriki

Shuriki is an evil power-hungry sorceress who will be the main antagonist in Elena and the Secret of Avalor.

Sofia the First
Forty-one years before the special, Elena and the Secret of Avalor, this power-hungry sorceress attacked the Kingdom of Avalor and killed King Raul and Queen Lucia. Avalor's Royal Sorcerer, Alakazar, cast a spell to protect the remaining members of the Royal Family of Avalor by placing them inside an Enchanted Painting. To buy Alakazar time, Crown Princess Elena of Avalor faced Shuriki on her own. Shuriki tried to strike Elena down but the Amulet of Avalor saved her life at the cost of her freedom by pulling her into it. Alakazar found the Amulet and sprited it away and Avalor fell to Shuriki, who would rule Avalor for the next forty-one years until she was defeated by Elena, who was freed from the Amulet of Avalor by Princess Sofia of Enchancia.

Elena of Avalor
Shuriki appears in the prologue of "First Day of Rule". She and her rule of Avalor are referenced by many of the characters in the series. In the first episode, it is mentioned that she forced some noblins to work for her and forced them to turn items into gold.

Trivia

 * Her name is a reference to the kanji in the phrase "Power to end everything" (すべてを終わる力), hence her goal to kill the King and Queen of Avalor.