Mughi, a genetically engineered creation of the World Welfare Works Association, bears the designation "Military Unit of Genetic Higher Intelligence" (or alternatively, "Military Utility Genetic Hyper Intelligence"), with his acronym reflecting his enhanced capabilities. In literary adaptations, he manifests as a sleek black panther-like entity equipped with tentacles extending from his forelegs, exuding a formidable, battle-ready aura that positions him as a direct combat asset. Animated portrayals reimagine him as a large, brown bear- or cat-like figure with a docile, pet-like demeanor. Though tentacles briefly feature in his debut animated episode, they vanish thereafter, aligning with his revised role as an onboard technician.

Functionally, Mughi operates electronic systems, serves as a co-pilot, and manages armaments aboard the Lovely Angel spacecraft. However, his limited combat proficiency in animated iterations often relegates him to remaining aboard during missions. Communication occurs through expressive physical gestures, complemented by a pragmatic partnership with the robot NAMMO. A notable contradiction defines his character: despite his intimidating stature, he exhibits a pronounced fear of mice.

While unwavering in loyalty across all media, his narrative involvement fluctuates—actively aiding protagonists in literary contexts while assuming a sidelined, occasionally humorous role in animated formats. Official sources do not elaborate on his background or evolution, cementing his status as a steadfast yet secondary support figure.