Jelsa

Jelsa is the crossover het ship between Elsa from Frozen and Jack Frost from Rise Of The Guardians (and by extension, from the Rise of the Brave Tangled Frozen Dragons fandom). Frozen fans hate this ship and find it as an insult to Disney and racist towards Elsa herself.

Canon
Elsa and Jack never met due to Jack being of DreamWorks character while Elsa is a Disney character.

Similarities and comparisons

 * They both use ice powers.
 * They both have a strong bond with their younger siblings, respectively.
 * The two conflicting personalities could definitely lead to some very interesting interactions and tensions.
 * Elsa is quiet, regal, mature and reserved as the perfect Queen, while Jack is very playful, a fun loving, mischievous, and trouble making spirit. They balance each other out, Elsa showing him the importance of being serious, and Jack showing her the importance of having fun and "letting it go". This has become quite a popular ship.
 * Elsa wanted to not be seen while Jack wanted to be seen.
 * Jack Frost wanted to remember his memories while Elsa wanted to forget them.
 * Others try to argue that Jack is over 300 years old, compared to Elsa who is only 21 years old. This is a popular trope in fiction pairing an immortal with a mortal (as an immortal vampire with a simple mortal human), the tragedy of their seperation through the test of time a prefereabl tool for drama and tragedy.

Fanon
The crossover pairing became quite popular after Frozen's release in November 2013; various forms of fanworks could be found: fanart, gifs, vids, fanfiction. Due to this, Elsa was often added to the Rise of the Brave Tangled Dragons fandom and then renamed the fandom as Rise of the Brave Tangled Frozen Dragons. It's by far the largest pairing for Elsa and one of the top pairings for Jack Frost as well.

One of the more influential artists for the Jelsa pairing was Kazeki, who had inspired a lot of people to fall in love with the pairing. However due to many people stealing her fanart and reposting them or making merchandise out of them she ended up leaving the internet (and fandoms in general).

Tumblr

 * jelsa tag on Tumblr

AO3

 * Elsa (Disney)/Jack Frost (Guardians of Childhood) tag on Archive of Our Own

DeviantArt

 * jelsa tag on DeviantArt
 * Jack-Frost-x-Elsa on DeviantArt
 * FrozenGuardians on DeviantArt
 * Jelsa-Forever on DeviantArt
 * Jack Frost and Elsa - Jelsa from FrozenShips on DeviantArt