The Little Mermaid AU

The Little Mermaid AU is an AU introduced through fanart, depicting the Big Four (or at least one of the characters) as mermen and mermaids. This can be considered a spinoff of Fairy Tale AU and Hybrid AU.

About the AU
This AU was formed through fanart of the Big Four (most commonly Jack and Hiccup) depicting them as merfolk or humans interacting with merfolk. Like its namesake, most writers and artists use Disney's The Little Mermaid as a template, but this is not required.

For whatever reason, this AU is most often used as a scenario for the pairing Hijack.

Hiccup Horrendous Haddock III
As a merman, Hiccup is often portrayed as having a prosthetic tail fin, as a counter part for his leg. His tail is often green in color. Toothless is most often portrayed as a shark, dolphin or orca. Hiccup would most likely have the same basic idea as he did on berk just underwater. The dragons are often portrayed as existing sea animals, extinct sea animals or mythological sea animals. He is also portrayed as Eric from The Little Mermaid as Merida is portrayed as Ariel, because of the Mericcup pairing.

Jack Frost
Being the mysterious, magical being, Jack is the one most often portrayed as the Merman. But also as Eric from The Little Mermaid, because of Jelsa and Jackunzel pairing.

Merida DunBroch
She is often portrayed as a mermaid, but when it comes to The Little Mermaid she is portrayed as Ariel, because of her hair, as Hiccup would be portrayed as Eric, because of the Mericcup pairing.

Rapunzel Corona
She is also portrayed as Ariel from The Little Mermaid as Jack is portrayed as Eric, because of the Jackunzel pairing.

Princess Anna of Arendelle
She is portrayed as an average mermaid or as Ariel from The Little Mermaid, because of her hair.

Queen Elsa of Arendelle
She is often portrayed as an average mermaid, but is still allowed to have her ice powers because of the movie Frozen. Also she is portrayed as Ariel from The Little Mermaid, because of Jelsa.

Fanfiction

 * The Crippled Drake by Paoshirou-Hozomi
 * What the Water Gave Me (HiJack) by KT-ExReplica
 * Mermaids are Real! by Aiko-Wind
 * Merfolk by Tears and Rain
 * Hijack Oneshot Requests (Chapter 32) by Alexandria Keating
 * How To Train Your Dragon: The Musical (Chapter 18) by Litwick723
 * Caves ad Cold Waters by Infrared-Ultraviolet
 * The Merman and the Viking, Part 1 by HorrorFan6