Ukkari is a henchman in the Bratcher gang (sometimes called the Blatcher gang), led by Black Express. He possesses a careless and daydreaming personality, leading to frequent comedic failures during the gang's schemes. His duties typically involve participating in Operation Darkness, the gang's plan to cover Earth in darkness, though his absent-minded nature often causes mistakes. Ukkari and fellow henchman Dozilas form a bumbling duo whose misadventures inadvertently hinder their leader's plans. Despite their antagonistic roles, both Ukkari and Dozilas exhibit unexpectedly kind-hearted tendencies, including a noted fondness for playing with children. Available official media provides minimal elaboration on Ukkari's background, lacking significant character development or expanded backstory. His primary narrative function is that of a comedic foil within the antagonist group, occasionally highlighting his non-malignant nature, such as during the Bratchers' failed attempts at impersonating Santa Claus in Christmas-themed episodes.