Brian Brandon is an inspector with the Royal Investigation Service (RIS), specializing in information analysis and technical support during investigations. He excels in managing digital evidence and technology, serving as the team's primary technical resource. Physically, he appears as a young man with light brown hair, blue eyes, and a slender, almost-fit build, often seen working with computer equipment during operations.

Personality-wise, he balances sociability with occasional social awkwardness, embodying a "kid brother" dynamic among colleagues. He prefers analytical problem-solving over physical confrontation but demonstrates resourcefulness and bravery when threatened—evidenced by his ability to fend off an assailant while strategically planting evidence to facilitate an arrest. Despite his recognized investigative skills, his professional inexperience sometimes fuels perceptions of unreliability.

Interpersonally, he shares enduring friendships with Lily Hoshina and Mario Luis Zurita, rooted in their police academy history. He harbors unreciprocated romantic feelings for fellow RIS member Kaela Yoshinaga. Additionally, he privately admires Keith Flick, curating documentaries and books about Keith's investigative career, including a volume titled *The History of Keith*.