Rasha is an infant thrust into the company of Lupin and Jigen after a chaotic heist targeting royal treasures from the floating city-state of Shahalta. Entrusted to the thieves' care following the theft, this baby boy compels Lupin and Jigen into unexpected temporary guardianship. His presence tangibly shapes their subsequent actions, forcing the duo to navigate their adventure while simultaneously protecting him and attending to his infant needs. Physical descriptions portray Rasha as distinctly unappealing in appearance. The narrative explicitly details scenes involving his basic bodily functions, including a prolonged sequence focused on a bowel movement. Despite his central role in the plot, Rasha possesses no royal blood. His significance stems solely from being the child of a Shahaltan royal guard member, connecting him to the conflict without granting political status. Primarily, Rasha functions as a catalyst for character interactions and comedic situations, particularly highlighting Lupin and Jigen's unanticipated paternal behaviors. His care also triggers a brief, distinct reaction from Goemon Ishikawa XIII, who departs specifically to fetch a traditional Japanese toy upon encountering the infant with the thieves. Details of Rasha's life prior to the heist, his existence after the events, or appearances in other Lupin III media remain undisclosed.