Friskriel

Friskriel is a non-binary ship between Frisk and Asriel Dreemurr in the Undertale fandom.

Canon
Of all the characters in Undertale, Asriel is the one who knows about Frisk's power to reset from the beginning. Since Asriel and Flowey are the same person, he is the character Frisk meets at the start and the last character Frisk fights at the end.

During the game, Flowey (Asriel) follows Frisk around. Flowey mistakes Frisk at various points for his old dead best friend. He tries to lock Frisk into an unending battle because he wants to stay with them forever, as he's scared of being alone and he feels like Frisk is the only person who's fun to play with.

Frisk eventually reaches out to him and 'saves him', which makes Asriel calm down and release all the souls to finally let 'monsters go free'. Frisk can choose to forgive or not forgive Asriel, and comfort or not comfort Asriel. If you don't forgive him, he understands. If you comfort him, you give Asriel a hug.

At the very end of the Pacifist ending Frisk and Asriel talk around the flowers where Asriel died and Chara was buried. When Asriel asks why Frisk claimed the Mountain he asks if it was fate, or something else, 'but only you know that Frisk'. He says Frisk is the friend he wishes he always had. Frisk is the last one to see Asriel.

Fanon
Many people ship them due to their interactions in the Pacifist Route and since both are kids.

Frisk and Asriel are two of the only characters who remember all the resets Frisk does in detail, which make them have a special bond for some fans.

Fandom
AO3

DeviantArt
 * friskriel tag on DeviantArt
 * frisriel tag on DeviantArt
 * asrisk tag on DeviantArt
 * friskxasriel tag on DeviantArt
 * asrielxfrisk tag on DeviantArt
 * Asriel-X-Frisk-Club fanclub on DeviantArt

Tumblr
 * friskriel tag on tumblr
 * frisriel tag on tumblr

Variations

 * Flowisk - the ship between Frisk and Flowey
 * Chariskriel - the polyship including Chara