Shrek (TTR)

Shrek is an Orge from the land of Far Far Away, now fighting in the Neo Asgardian Coliseum.

Story
Shrek was captured during Hazel's occupation of Far Far Away, and had his memories wiped so he could participate in gladiator matches for the amusement of Hazel's supporters and subjects.

He fights Sora in the coliseum after the latter frees four worlds from Hazel's control, and starts regaining some of his memories after their fight, eventually agreeing to help the Keyblade wielder fight the evil Empress.

Trivia

 * Most of Shrek's battle quips are quotes lifted/paraphrased from Fat B@$tard of Austin Powers, who is also portrayed by Mike Myers, and has a similar Scottish accent.
 * Shrek's role in The Third Ragnarok is close to that of the Hulk in Thor: Ragnarok, since they are both big green humanoids who come to be associated with Sora and Thor respectively. Even Loki is terrified of Shrek, due to the similarities between him and Hulk, as a tongue-and-cheek meta-reference to Hulk beating up Loki in The Avengers.