Nimbalo the Slayer was a cheeky harvest mouse who lied often and liked to play any form of instrument (but mostly the flute) and sang songs. He wore a yellow tunic, and was extremely small. Tagg met him out on the flatlands, where he was being attacked by a snake. Tagg stunned the snake and set Nimbalo free, though the mouse huffily insisted that he had not needed any help. This disagreement notwithstanding, they soon became good friends, with Nimbalo steadfastly sticking by his friend through thick and thin, even helping to rescue the otter from Yo Karr when the giant eel pulled him under.