Elsa

Elsa is the queen of Arendelle who appears in Kingdom Hearts III, and originally taken from the Disney film . She is sisters with the princess Anna.

Kingdom Hearts Union χ
Elsa's power is channelled by the Book of Prophecies to form the Supernova - Elsa and the Anna & Elsa Medals.

Before Kingdom Hearts III
When Elsa was little, she used to remain close to her younger sister Anna, but one day she shuts her off for an unknown reason.

As the years passed, Anna and Elsa barely saw each other until the day of her coronation, making Anna excited as she thought she finally got a chance to speak with her sister again. Unfortunately, at the party, Anna got into an argument with her sister, resulting in Elsa unleashing her magic to push her away. This resulted in Elsa running away from Arendelle, feeling frightened she might hurt others.

Kingdom Hearts III
Upon arriving in Arendelle, Sora notices Elsa fleeing across the sea, transforming the water into ice as she runs feeling scared. Curious if something happened to her, Sora, Donald, and Goofy go after her to the North Mountain and speak with her. When they meet, Elsa hesitantly asks who are they, to which the trio introduces themselves. Elsa tells the trio to return back to the village and needs to be left alone. Feeling concerned, Sora tries to ask her about her troubles, resulting in Elsa unleashing her magic at the trio, much to their shock. Eventually, this attracted the Heartless appearing, leading to the trio taking care of them while she seeks cover.

After defeating the Heartless, Elsa thanks them for protecting her and apologizes for getting upset. When a Heartless prepares to attack the trio from behind, Elsa uses her magic on to destroy it. Sora is impressed by her ice powers, but Elsa believes that her magic only hurts people. Sora then tells Elsa to return back home before more Heartless show up, but tells him she plans to isolate herself in the mountain to keep Arendelle safe from her and creates a wall of ice to prevent Sora, Donald, and Goofy from following her.

Appearance
Elsa is a young woman with blonde hair and blue eyes. When Sora first encounters her, she wears a teal-and-black dress with a magenta cape and a gold tiara on her French braided crown twist bun. Eventually, Elsa switches to a blue dress, wearing her hair in a loose French braid that is swept over her left shoulder.

Origin
Elsa first appeared in the 2013 Disney film Frozen, voiced by Idina Menzel. She is a composite of two characters from Hans Christian Andersen's : Kai, one of the story's protagonists, and the titular Snow Queen herself.

In Frozen, Elsa and Anna were orphaned at a young age when their parents King Agnarr and Queen Iduna died in a seastorm. Elsa was born with the power to control ice, although it is never explained why. Due to her powers, Elsa developed shame and guilt after almost killing Anna in their childhood. Years later, on the day of her coronation as queen, Elsa accidentally reveals her powers and flees Arendelle in fear after being called a witch. While fleeing, Elsa accidentally puts Arendelle in a increasingly dangerous snowstorm. She builds a castle with her powers, creating Olaf in the process. Anna takes it upon herself to locate her sister and find a way to save Arendelle.