KFC

KFC is the familyship between Kris from the Deltarune fandom and Frisk and Chara from the Undertale fandom.

Canon
The characters have not interacted as Kris only appears in Deltarune while Frisk and Chara appear in Undertale. Kris seems to be the Deltarune counterpart of both Frisk and Chara. Similarities included:
 * All three are humans.
 * All three have the red SOUL, speculated to represent determination.
 * All three have similar haircuts.
 * None of the three have a determined gender.
 * Kris is a playable character like Frisk.
 * Kris' name is one letter away from being an anagram of Frisk.
 * In the Light Realm, Kris has the same skin and hair color as Frisk.
 * Kris wears a green/yellow shirt similarly to Chara.
 * Like Chara, Kris was adopted by the Dreemurrs.

Fanon
Following the release of Deltarune, fanart of this trio started to be made as Kris had similar traits to both Frisk and Chara. In fanart, Kris is often portrayed as the older sibling of Frisk and Chara. This familyship can be seen as an expansion to a family version of Charisk, where Chara and Frisk are portrayed as siblings.

The name KFC for the ship comes from the first letters of each character and the fact that it is the acronym of Kentucky Fried Chicken. DeviantArt user Kaitogirl has made fanart of the three at KFC. The acronym has been in use for the trio since at least early-mid-November 2018.

On AO3, the tag for this trio is not very common. The first use of this trio was on December 12, 2018, in Flirting in the Void by wordbending. The trio is more popular on DeviantArt, where there are over 200 pictures of the three together, although they are not always portrayed as a family.

Fandom
FAN FICTION

DEVIANTART