The donkey who impersonates Aslan in The Last Battle is Puzzle.
Puzzle is a gentle but naive donkey living in western Narnia. The clever ape Shift persuades him to wear a lion’s skin, then presents him to other Narnians as the Great Lion Aslan. Puzzle does not invent the deception; he is manipulated into playing the part.
Shift exploits Puzzle’s disguise to claim that Aslan and the Calormene god Tash are the same being, creating the false figure “Tashlan.” This confusion helps Shift and the Calormenes control Narnia and justify cruelty in Aslan’s name.
A common mix-up is confusing Puzzle with Shift, who is the mastermind, or Tash, who is the frightening deity invoked in the fraud. Puzzle’s role also echoes the old fable of an ass wearing a lion’s skin, a story about appearances being mistaken for authority.