Charisk

Charisk is the non-binary ship between Frisk and Chara from the Undertale fandom.

Canon
Chara, the first human felt in the Underground, died long before Frisk began their journey, but somehow their essence was attached to Frisk's body when they fell in the Underground. Their very ambigous relationship is determined by player's choices:
 * Chara remains silent during Neutral and True Pacifist run, except for showing their remembers in some occasions; during Pacifist final boss battle, Frisks calls "someone else"'s name, which have been speculated been Chara;
 * During a Genocide run, instead, there are some elements which have been intepreted by fans as if Chara was possessing Frisk's body;
 * At the end of a Soulless Pacifist run, Chara seems taking full control of Frisk's body, as their appapearances are changed into Chara's ones.

Fanon
Since canonically they're both children and Chara is some sort of demonic ghost, all Charisk shipping AU presumes Chara has somehow been relived (or at least seems to habe been relived) and they've both grown up.

Since neither of them gender is specified in game, they're variously portraited as an het, slash or femslash couple.

Some people ship it because Chara and Frisk have the a 'soul buddies/connected personalities/dark mirror'. They're both tied up with the Player Concept as well and are both shown to be kids, so it means there's effectively a heap of common ground between the two, especially for fans of pacifist interpretations of Chara/sympathetic Chara.

Regardless, the ship is mostly all sorts of headcanon. Most popular option is Frisk being the passive, cute and kind, while Chara is the strong, protective and caring; two people from the opposite angle.

Fandom
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Trivia

 * The names Frara and Chisk, which also combine "Frisk" and "Chara", exist in the fandom, but usually refer to unofficial characters combining traits of Frisk and Chara rather than the ship between the two.