Ursula (Knights of Fables)

Princess Ursula, also known as the sea witch, is a fairy tale character from The Little Mermaid by Hans Christian Andersen, who makes a deal with a mermaid that has fallen in love with a human prince. She is a villainous cecelia (half-woman, half-octopus) who strikes deals with unfortunate merfolk with the promise of making their dreams come true. Ursula's contracts, however, are covertly designed to advance her own ambitions and cause general misery.

Ursula is based on the sea witch and the titular character from the fairytale "The Little Mermaid", and on one of Poseidon's daughters from Greek mythology. She is also based on the character of the same name and partly on Ariel from the Disney film, The Little Mermaid.

Background
Born to King Poseidon and his unnamed wife. Ursula was the youngest of seven sisters, who born as a Cecelia, and not a mermaid disgusted her father Poseidon. Out of jealousy she murders her six older sisters, when their father died, the pair were given an equal share of the sea plus two magical items. Triton received the trident while Ursula received the magic Nautilus shell. Though the two were to rule the seas together, Ursula's greed and use of dark magic to usurp Triton led to her being banished.

The Little Mermaid
She was banished and exiled from Atlantica by King Triton and commands Flotsam and Jetsam to keep an extra close eye on Ariel believing that she is the key to Triton's undoing. After Ursula realizes that Ariel has fallen in love with Prince Eric, she believes that Ariel will make a good spot on Ursula's garden (the merpeople turned into polyps by Ursula). After Flotsam and Jetsam take Ariel to Ursula, Ursula makes a deal with Ariel by saying to her if she kisses Eric by sunset on the third day, she will remain human but if she doesn't she'll transform back into a mermaid and will belong to Ursula and tells Ariel that in order to become human, she needs her voice (Poor Unfortunate Souls).

She later takes Ariel voice and transforms her into a human. After Flotsam and Jetsam disturb Ariel and Eric's moment (Kiss the Girl), Ursula decides to transform into a human herself and renames herself Vanessa. She later uses Ariel's voice so she can make Eric believe that she was the one who rescued him from the shipwreck and make Ariel be her prisoner.

After she was going to marry Eric, she was later distracted and disrupted by Scuttle, and the rest of the sea animals and after Max (Eric's dog) bites Vanessa, Scuttle pulls her necklace and releases Ariel's voice and returns to Ariel. After sunset, Ariel transforms back into a mermaid and Vanessa turns back into Ursula and kidnaps Ariel only to be stopped by King Triton and Sebastian. Triton later sacrifices himself to Ariel and becomes Ursula's weed, then Ursula takes his crown and his trident. After she was cut by Eric, she sends Flotsam and Jetsam to take down Eric but was later defeated by Sebastian and Flounder, and when Ariel pulls her hair, she accidentally kills Flotsam and Jetsam which makes Ursula say, "My Babies, my poor little poopsies".

Then Ursula later turned into a giant monster and tries to kill Ariel and releases the powers of the ocean. She is then killed by being stabbed by Eric with the ship and she is later destroyed and with her powers gone, all of her other victims were transformed back to themselves. After the trident lands by King Triton, he transforms back into a merman and gets his crown back.

After that, Ursula becomes a well-known villain in Fantasia, earning the nickname "Sea Witch". The Sea Witch is considered a legend among witches, along with the Snow Queen. Rumoured to be alive she lives in seclusion and is rarely seen and never attends the witches' meetings. Along with the icy sorceress, the sea hag is one of the most powerful sorceresses in the world, so powerful that even Morina is humble before her.

It is revealed that Ursula has a heated rivalry with Maleficent, the Dark Fairy