Dr. Senoh, primarily referred to as "Old Man" or "Researcher" in Japanese media, acts as Shadaloo's chief scientist in the 1994 animated film. He holds a high-ranking position, reporting directly to M. Bison and overseeing all scientific operations. His key responsibility is developing advanced technologies like the Monitor Cyborgs, deployed worldwide to surveil and analyze martial artists for recruitment or elimination, successfully identifying fighters such as Ryu and Ken Masters based on their combat prowess and shared style.

He first appears presenting a Monitor Cyborg prototype to Bison. During this briefing, he reports difficulty locating Ryu and voices skepticism about the fighter's rumored power level, though Bison dismisses these doubts and demands intensified efforts. Dr. Senoh communicates remotely throughout the film, updating Bison on critical developments: confirming the assassination of an Indian prophet, highlighting Ken Masters' combat footage as a potential alternative recruitment target, and raising concerns about Cammy's detainment by Interpol. Bison addresses the Cammy situation by dispatching Sagat to eliminate her, temporarily easing Dr. Senoh's worries. His final narrative action is informing Bison of Ryu's location in Thailand, enabling the confrontation that leads to the base's destruction. His ultimate fate remains undetermined.

Physically, Dr. Senoh is elderly with a frail build. He wears a white lab coat featuring the Shadaloo insignia, has a bald crown with long pink hair on the sides, and shows minimal visible teeth when speaking. Personality-wise, he demonstrates unquestioning loyalty to Bison and a serious, professional demeanor regarding his research. Despite this loyalty, he voices concerns to Bison, such as questioning Ryu's capabilities or warning about the risks if Cammy's memories resurface, indicating a degree of professional respect within Shadaloo.

A Brazilian comics spin-off provides his alias, Dr. Haruo Ichihara, identifying him as the former head of Shadaloo's scientific division. This storyline, set months after Bison's presumed demise, reveals the name through Interpol agent Chun-Li's investigation. Beyond this alias reveal, no further canonical development or backstory exists in other media like games, OVAs, or alternate seasons. His sole video game appearance is a non-speaking cameo in Bison's ending for *Street Fighter Alpha 2*, depicting him preparing to brainwash Ryu alongside Bison.