Arielsa

Arielsa is the femslash ship between Elsa and Ariel from the Disney fandom.

Canon
As Ariel and Elsa are from different series, they have never met. While the two do appear in Ralph Breaks the Internet, and have a few brief interactions. Ariel joins Elsa on Jasmine's carpet, after emerging from the water spiral. Elsa will then freeze the water spiral, and Ariel will stand in front of Elsa when they reach Ralph. In Once Upon A Time, Elsa end up unknowingly trapping Ariel in a bottle along with Blackbeard's crew.

Ariel and Elsa both lost their mothers to ship wrecks, and have blue sparkly dresses created from magic. They also both have castles that are situated by the sea, and have a second castle in a completely different enviroment. Elsa has magical abilities, while an episodes of The Little Mermaid tv series, did have Ariel gain powers for a short while. Just like Elsa, her powers get out of control but Ariel is able to get rid of them.

The two were able to bring two different types of people together, but end up having to leave their families in order to start anew in the other land. Elsa tamed and befriended four magical beings, the Little Mermaid TV series has Ariel meeting and encountering other kinds of magical beings that many others have deem as dangerous. Along with the show having Ariel riding on the back of a giant Seahorse, while Elsa taming the Nokk had made the water spirit her personal steed.

Fanon
Elsa and Ariel are shipped by a few fans, but are considered a rare pair. Artists and writers who enjoy Modern AU's will depict the two in the clothes they wore in Ralph Breaks the Internet. The ship became more popular after the Frozen II trailer, where it showed Elsa running across the ocean. Fans wrote and drew Ariel coming upon Elsa as she attempts to cross, helping her cross, or saving her after she falls under the water.

On AO3, the ship has 11 fanfics.

Fandom
FAN FICTION
 * Ariel/Elsa (Disney) tag on FanFiction.Net
 * Ariel/Elsa (Kingdom Hearts) tag on FanFiction.Net
 * Ariel/Elsa (Once Upon A Time) tag on FanFiction.Net
 * Ariel/Elsa (Once Upon A Time) tag on FanFiction.Net

TUMBLR

Trivia

 * The group photo taken with Vanellope, in the trailer for Ralph Breaks the Internet, Elsa is seen above Ariel.
 * The two are from two of the few Disney films that have become Broadway shows. As well as them being featured in the Disney on Ice show.
 * They are two of the limit time characters, with their own limit time clothing, in Disney Magic Kingdoms.
 * They are two of the Disney Princess characters who met Sora in their own home worlds in the Kingdom Hearts series, as well as both of them appearing in the same game, Kingdom Hearts III.
 * Elsa is the oldest sister while Ariel is the youngest.
 * They each have two castles.