Seavil

Seavil is the slash ship between Seam and Jevil from the Deltarune fandom.

Canon
Jevil and Seam were once close friends and co-workers. Seam worked as the Court Magician and Jevil worked as the Court Jester. However, one day Jevil encountered a "strange someone", presumed to be the, and went insane. Following this event, Seam was forced by the four Kings to lock Jevil away.

Following Jevil becoming crazy, Seam started to see the world more pessimistically. When talked to, Seam explains that Jevil's crazy talk has made him see the world "darker, yet darker" ever since.

Kris, Susie and Ralsei can find Jevil on the ?????? floor of the Card Castle. If they talk to Jevil, he mentions that Seam knows about the key.

When Kris and their team talk to Sean after encountering Jevil, Seam tells the three about his past with Jevil. Although he thinks Jevil's destruction is some of the greatest chaos, he is still willing to let Jevil be released from prison. He gives the team Broken Key A, as well as a hint of where Broken Key B is located.

Fanon
Following the release of Deltarune, Seavil has become one of the most popular ships in the fandom, and the most popular not involving any of the main three (Kris, Ralsei, Susie) or pre-existing characters from Undertale.

On AO3, Jevil/Seam is the second most popular ship in the Deltarune fandom, as well as the most popular ship for both characters. The non-romantic ship between the two is the second most popular ship for both characters, only behind the romantic ship.

Fandom
FAN FICTION

DEVIANTART