Saito Uebu works in MHK Enterprises' Digital Planning Department, joining concurrently with colleague Hanbee Kikaku. He creates and manages online pre-sale pages for "Together with Maman" merchandise and photographs the show's hosts for website content.

Standing 1.80 meters tall, he has short black hair and blue eyes. His typical attire includes a lavender dress shirt, black dress pants, a belt, dark brown dress shoes, and thick black-rimmed glasses. His blood type is A, birthday is May 14, and he avoids smoking and heavy drinking.

He projects a cold, detached aura, avoiding coworker interactions. Stoic and unfazed, he remains unmoved by Hanbee Kikaku's frequent criticisms about his merchandise pages' low sales potential. Despite this dynamic, they maintain mutual professional respect as contemporaries who started together, with Hanbee describing him as stubborn.

A dedicated otaku preferring two-dimensional media, he leaves work precisely on time to watch live anime broadcasts. His disinterest in three-dimensional relationships surfaces during workplace events like New Year's parties, where he demonstrates no attraction to real women.

His surname Uebu (上武) combines "top, upper" (上) and "military, martial" (武), while his given name Saito (裁人) incorporates "cut out, judge" (裁) and "person" (人). Together, his full name Uebu Saito forms a phonetic pun on the English word "website" (ウェブサイト, webusaito).