Sylkius

Sylkius is the poly ship between Loki, Sylvie Laufeydottir, and Mobius M. Mobius from the Marvel Cinematic Universe fandom.

Canon
Sylvie was abducted by the TVA as a child and escaped, and later began attacking the TVA's Minutemen and stealing their Reset Charges. Mobius is the TVA analyst assigned to track her down, only knowing that it's a dangerous Loki variant.

When Loki is taken in by the TVA, Mobius recruits him to help with his case, since studying this Loki may help him catch the Variant. Loki and Mobius develop a friendship while working together. Loki realizes that the Variant is hiding in apocalypses, and he and Mobius narrow down where Sylvie is hiding. The two are part of the team that go to a Roxxcart superstore in 2050, which is the site of an apocalyptic hurricane. Mobius wants to keep Loki with him, but Hunter B-15 is in charge of the operation and forces them to separate.

Loki and Sylvie first meet at the Roxxcart store, where Sylvie is preparing her attack against the TVA. She fights with Loki to stall him while she gets the rest of her plan ready. When everything is in place, she activates and sends out the Reset Charges, bombing the Sacred Timeline to distract the TVA. She opens a Timedoor, waves to Loki, and steps through. Mobius comes running for Loki, calling for him; Loki looks back, but he runs through the Timedoor after Sylvie. Loki follows Sylvie's path through the TVA and confronts her outside the elevator to the Time-Keepers' chambers. They're interrupted by Ravonna Renslayer, who nearly prunes (disintegrates) them, but Loki grabs Sylvie's TemPad and opens a Timedoor beneath them, dropping them outside the TVA. Loki and Sylvie then spend the next 12 hours trying to get off Lamentis-1 and getting to know each other. Meanwhile, Mobius and the TVA monitor the Timeline for any signs of a Nexus Event to find them. As the planet is crashing into Lamentis-1 to destroy them, Loki and Sylvie hold hands and cause a Nexus Event. The TVA goes to their location, and Loki and Sylvie are apprehended by Mobius and the TVA.

Mobius questions Loki, who tells him that the TVA has been lying to him; Sylvie revealed to Loki that everyone at the TVA are Variants, which includes Mobius, but Mobius doesn't believe him. In questioning, Mobius realizes that Loki likes Sylvie, and their bond could have caused the Nexus Event on Lamentis, and Mobius riffs Loki about it. After looking into things at the TVA more, Mobius realizes that Loki was telling him the truth about everyone at the TVA being Variants, and he goes to help Loki escape and save Sylvie. But Ravonna confronts them and has Mobius pruned (disintegrated) as Loki watches.

Loki and Sylvie meet up again in custody and are taken to the Time-Keepers. Loki and Sylvie break free and fight back-to-back to defeat the guards. Sylvie beheads one of the Time-Keepers, and they discover that the Time-Keepers are just androids, controlled by someone else. Loki turns to Sylvie, and struggles to try to tell her something important, but before he can say it, Ravonna prunes Loki, disintegrating him in front of Sylvie. Sylvie fights and defeats Ravonna and questions her. Ravonna tells her that Loki is still alive, at the end of time where the timeline is still being written. Corned by more guards, Sylvie self-prunes herself to meet up with Loki.

Sylvie lands in The Void. She runs from the destructive creature Alioth, and Mobius drives to her and she jumps into the car and they get away. While Mobius and Sylvie had previous encountered each other when she was apprehended on Lamentis-1, this is the first time they talk. Mobius apologizes for his work with the TVA and for hunting Sylvie. Sylvie comes up with a plan to enchant Alioth, and Mobius goes along with it and turns the car around to go back to it.

As they head back to Alioth, they reunite with Loki, who runs to Sylvie when he sees her get out of the car, and he's excited to see them both. Loki is skeptical of Sylvie's plan to enchant Alioth, but Mobius supports Sylvie, commenting that she's confident that she can do it.

Loki and Sylvie later talk about Mobius's theory about the Nexus Event on Lamentis, which Mobius also told to Sylvie.

As they put their plan to motion, Sylvie gives Loki the TemPad so he can go back to the TVA, but Loki decides to stay with Sylvie and help her. He hands the TemPad to Mobius, who opens a Timedoor to return to the TVA and take down the organization from within. Before he leaves, he and Loki hug, and Mobius tells Sylvie that she's his favorite. Mobius returns to the TVA to "burn it to the ground", which Loki said he wanted to do when they first met. Loki and Sylvie fight and enchant Alioth together.

Fanon
Sylkius grew in popularity after it became apparent that Sylki (Sylvie and Loki) would possibly become canon after episode 3. Lokius (Loki and Mobius) was the most popular ship from the beginning of the Loki series, and part of the appeal of Sylkius is that it leaves none of the three major characters out of a central relationship.

Fandom
FAN FICTION

TUMBLR
 * Fanart: Loki and Sylvie argue about who's Mobius's favorite by chiiinken
 * Fanart: Hug by ioannushka
 * Fanart: "You're my favorite" / "Traitor" by mintyisdrawing
 * Fanart: Go for it, Loki! by mushigo-palm-spores
 * Meme by acespacedweller
 * Meme: Loki has two hands / alt

TWITTER
 * Fanart: give them a happy end pls by @ioannushka_
 * Meme: my boyfriend's-boyfriend

INSTAGRAM
 * Fanart: Mobius and his favorite variants by badonkadraws
 * Fanart: Summer vibes by stoffel.art
 * Fanart: "You're our favourite as well, dear Mobius." by stoffel.art

Variations

 * Lokius refer to the ship between Loki and Mobius
 * Sylki refers to the ship between Sylvie and Loki