Monmi appears as a monkey character within the film's narrative. She serves as a companion to another monkey, Monkichi. Both join the final conflict against the antagonistic forces, with Monmi fighting alongside Monkichi and the Bat-Family during the climactic battle at the "Field of Hell." Monmi specifically aids Monkichi as he uses a special flute to command an army of monkeys formerly controlled by Gorilla Grodd. This coordinated effort enables the formation of a giant samurai monkey entity. This entity then combines with a swarm of bats, resulting in the creation of the "Batgod" construct deployed against the merged castle robot, Lord Joker.