Sylkior

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

Canon
Loki and Thor are brothers, and Loki and Sylvie are variants of each other from alternative timelines. Due to the time-travel aspect of the Loki series, there are some variations in the canon/history of each character in this relationship.

Quotes
"God. Now I understand why Thor found this so annoying."

- Loki on Sylvie; The Variant

Fanon
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. After 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.

The ship is still very new, and there are very few fanfics for them, with only six on AO3 one week after the Loki series ended.

Since Loki and Sylvie are variants of each other, some fans believe that Thor would embrace Sylvie as another sibling. Some fanart depicts post-Endgame Thor thrilled to have Loki and Sylvie (and sometimes other Loki variants) with him in this manner. Examples:
 * Fanfic: Wear Your Tragedies by RedactedReader, in which post-Endgame Thor calls Sylvie "sister" and they discuss this and their relationship with Loki
 * Fanart: Family portrait by @mjarmerchant
 * Fanart: I love them & want them to be a big awkward family by @solidafg
 * Fanart: Sibling bonding time by @MysiePereira
 * Fanart: Siblings? Siblings by @octisquad

Fans also ship the three of them romantically. Some fanworks start with Loki and Sylvie's canonical romantic relationship, and the two bring in Thor when they go to find him after destroying the TVA. Others start with Loki and Thor having a relationship, and then bringing in Sylvie. Examples:
 * Fanfic: Two of a Kind and One to Spare by ambiguously, in which Loki takes Sylvie to meet Thor and it turns sexual
 * Fanfic: Lost and Sound by snack_size, in which Loki and Sylvie have an initial relationship and bring in Thor
 * Fanfic: meet your storm by maharlika, in which Loki and Thor have an initial relationship and bring in Sylvie

Fans also explore the ship with AUs of Sylvie being part of the main timeline:
 * Fanfic: take only what you need by tediousTricks (ghostlyAnarchist), in which Thor has an arranged marriage with Sylvie of Jotunheim and Loki is afraid of losing him
 * Fanfic: the envy of eden by maharlika, in which Sylvie is Thor's adoptive sibling and they bring in Loki from an omega auction

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
 * Love them by @MorgenSevermalt
 * Ragnarok Thor won the Sylkior poll! by @moopzies
 * Sylkior makeouts by @moopzies
 * He is bisexual (他是双性恋呀) by @_Micias_
 * Welcome home by @ramenana

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