The Nightmare Before Christmas/Ships

= Jackily = 

Jackily is the ship between Jack Skellington and Emily.

Fandom
= Sallily = 

Sallily is the ship between Sally and Emily.

Canon
Being from different movies, Sally and Emily never met. However both have in common that their movies were created by Tim Burton. They have a similar aesthetic, being both undead young girls with blue skin. Both can remove body parts, though unlike Sally, Emily rarely control them. Both feel anguish and loneliness during their films, with Sally's lack of freedom due to Finklestein and Emily spending years waiting for her lover since his death. Both have feelings for the protagonist, and believe that theirs will not be possible because of Emily being dead and Victor being alive and enganged with other, while Sally is always locked up by Fiklestein and barely receives Jack's attention (though they end up together, unlike Victor and Emily).

Fanon
Sallily is a well liked ship in both fandoms. The duo became popular fastly due to them being the most iconic Burton female characters and looking similar as well. Eventually, there's been many fanarts of the two together. Some of them also include Victoria due to her being the second female protagonist in Corpse Bride.

However, some Jally and Vemily fans prefer them as friends. Some people headcannon that Sally and Emily would be great friends, or een best friends. That didn't stopped some people to ship them romantically. Some people also like other traits of the pair such as the red-blue contrast and Sally being poor´looking while Emily looks more elegant. Some fans theorize that emily ended up in Halloween Town after the end of her movie, so the two could met after all.