Sylkior

Sylkior is the family/poly ship between Loki, Sylvie Laufeydottir, and Thor Odinson from the Marvel Cinematic Universe fandom.

Fanon
Since Loki and Sylvie are variants of each other, many fans believe that Thor would embrace Sylvie as a family member. The three are also shipped romantically.

Fans began taking an interest in the ship following episode 3 of the Loki series, and the term Sylkior came into usage on social media. As Loki and Sylvie bonded on Lamentis in episode 3, fans began to ship Loki and Sylvie both romantically and platonically as being like long-lost twins, and fans began to imagine their relationship with Loki's brother Thor as well.

Fandom
FAN FICTION

TWITTER
 * Family portrait by @mjarmerchant
 * I love them & want them to be a big awkward family by @solidafg
 * Sibling bonding time by @MysiePereira
 * Siblings? Siblings by @octisquad
 * Sylvie meets Thor by @octisquad
 * Sleeping by @sensoriumz
 * Sylkior in bed (semi-NSFW but not explicit) by @ponderosa121
 * Meme "This is my boyfriend Loki, & this is Loki's boyfriend Thor" by @PrettiestThor
 * OT3 meme by @feelmynoize

TUMBLR
 * Another! by lousysharkbutt
 * "Wow Loki you were right! Your Thor is indeed hot" by deraniel

Variations

 * Thorki refer to the ship between Thor and Loki
 * Sylki refers to the ship between Sylvie and Loki