Billy Katagiri
Billy Katagiri is a key Mobile Suit developer and engineer in the Mobile Suit Gundam 00 series. Initially serving as a technical advisor for the Union military's anti-Gundam team, the Overflags, he later becomes the chief Mobile Suit developer for the autonomous peacekeeping force A-Laws. Throughout the conflict, he plays a vital technical role alongside his close friend, ace pilot Graham Aker.
Overview
Billy Katagiri is a key Mobile Suit developer and engineer in the Mobile Suit Gundam 00 series. Initially serving as a technical advisor for the Union military's anti-Gundam team, the Overflags, he later becomes the chief Mobile Suit developer for the autonomous peacekeeping force A-Laws. Throughout the conflict, he plays a vital technical role alongside his close friend, ace pilot Graham Aker.
Appearance
He features long hair tied back into a low ponytail and wears rectangular eyeglasses. His standard attire consists of a long white lab coat worn over a military uniform. He is depicted with grey or blue eyes.
Personality
Generally mild-mannered and intellectual, Billy approaches mobile suit engineering with deep dedication. However, he is heavily influenced by personal attachments. When experiencing intense grief or perceived betrayal from those he trusts, his personality exhibits a sharp, vengeful focus.
Abilities
Billy possesses exceptional technical capability and analysis in Mobile Suit design. By analyzing the remaining research notes of the late Professor Eifman, he engineered the implementation of the Trans-Am System for machines equipped with pseudo solar furnaces (pseudo-GN Drives). He is also highly skilled at customizing specialized, high-performance mobile suits tailored to specific pilots.
Background
Billy began as a technical advisor for the Union assigned to the Overflags unit, investigating the mysterious Gundams alongside Graham Aker. Following the death of his mentor, Professor Eifman, he was recruited into A-Laws as chief Mobile Suit developer, successfully equipping pseudo solar furnace units with the Trans-Am System using Eifman's notes. After working through personal conflict regarding his former university classmate Leesa Kujo (Sumeragi Lee Noriega), he continued his engineering work and later formed a connection with researcher Mina Carmine.
Relationships
He shares a close bond of friendship with Graham Aker, acting as his primary engineer and tuning custom machines for him. Professor Eifman was his respected academic mentor. He harbored unrequited affection for his university classmate Sumeragi Lee Noriega (Leesa Kujo), and later built a close relationship with fellow researcher Mina Carmine.
Trivia
Official background details establish Billy Katagiri as being of mixed Japanese and Canadian heritage. He is often noted by fans for his endless technical patience when catering to Graham Aker's extreme design requests.