Mermaid Beauty

Mermaid Beauty is the femslash ship between Ariel and Belle from the Once Upon A Time and Disney fandoms.

Canon
Mr. Gold sent Ariel to Storybrooke, with the task of finding Belle so they could find a powerful item.

Fanon
While the ship is commonly focused on OUaT's version of the two, there are fans who use ship and its commonly used title with Disney's versions of them within the Disney Princess part of the Disney fandom, since the ABC television series has its own versions of the Disney characters and has a few traits from its series; and it being the live-action show that helped to trigger the ship in both fandom universes.

Fandom
FAN FICTION

Trivia

 * In the Disney film, Ralph Breaks the Internet, Belle and Ariel appear as online versions of themselves known as "netizens", the inhabitants of the digital made world that lies within the real-life internet. Where they are two of the fourteen Disney Princesses that are from the expo-like Disney website, Oh My Disney.
 * Both Belle and Ariel appear in the Disney Junior series show, Sofia the First, when the Amulet of Avalor summoned them to aid Sofia.