Volvo Saigo is a former green beret soldier with extensive combat experience from his US Navy service. This military background fuels heightened defensive instincts, causing aggressive reactions to minor auditory stimuli like glass tapping, nose hair plucking, or other subtle sounds he interprets as threats. His hypersensitivity manifests in disproportionate responses to everyday noises.

He exhibits a pronounced physical reaction to female presence, enduring severe nosebleeds upon sighting or physical contact with women. This condition intensifies with his American girlfriend, Jodie, potentially linked to prolonged exposure to male-dominated military environments. His ancestry traces back to ninja clans in Kyushu.

Volvo shares notable visual similarities with Duke Togo from the *Golgo 13* series, including comparable naming conventions in their character designs. His relationship with Jodie represents a recurring personal dynamic in his appearances.