Elsida

Elsida is the femslash ship between Elsa and Merida from the Brave and Frozen fandoms.

Canon
Since Elsa and Merida are from different series, they have never met in canon. However, there are a few official Disney crossovers that have the two interact.

Elsa and Merida are both the older sisters and first born children of their families, with a lot of pressure on them to be perfect. Both were very close with their families when they were younger, but began to drift apart from them as time went on.

Fanon
The ship is part of the  fandom and its sub-fandoms. The pairing is often featured in the crossovers common AU's. In a Frozen AU, Merida is often given fire powers. Another AU would be The Hunger Games AU with Elsa and Merida as Katniss and Gale. In Modern AU's the two are often depicted in their outfits form Ralph Breaks the Internet. Along with some of the ship's fan manip art having Elsa show Merida her powers.

As Elsa and Merida are the first two Disney Princesses without a love interest, fans started theorizing that they might be lesbians, and paired the two together. Their relationship is often given a fire and ice theme. Merida's fiery spirit and red hair contrasting Elsa's ice powers, put together nature, and platinum hair. When meeting, the two might not initially get along due to their contrasting personalities. The two would eventually get along better, and Merida would encourage Elsa to be more free, while Elsa would teach Merida to take responsibility for her royal duties. Fanfiction works often explore how they'd meet either in a canon or modern!AUs, with the two of them often finding their similarities appealing, and therefore getting closer. They're often paired alongside Kristoff and Anna.

On AO3, the pairing is the second most written ship for Merida. While on fanfiction.net, there are 61 fics in its crossover category of Elsa and Merida's films, with 22 placed under pairing, along with its Once Upon A Time category. Even though there are a small number of fans who like to focus on their OUAT counterparts, the ship is mainly supported in the Disney crossover fandom.

Fandom
FAN FICTION
 * Elsa/Merida (Disney) tag on FanFiction.net
 * Elsa/Merida (OUAT) tag on FanFiction.Net
 * Elsa/Merida (OUAT) tag on FanFiction.Net

TUMBLR

WIKIS
 * on the

Trivia

 * They both have Cameo's in Ralph Breaks the Internet.
 * They both appear in Once Upon A Time.
 * One of the ship's known titles, "Polar Bears", references Merida's bear connections and the icy element of Elsa's magic.

Variations

 * The Big Eight refers to the ship between the two and Anna, Flynn Rider, Hiccup, Jack Frost, Kristoff and Rapunzel
 * Merelsanna refers to the ship between Merida, Elsa and Anna