Dr. Namba is a scientist of Team Rocket who appears as a recurring antagonist within the anime, notably in both the original series and Pokémon Chronicles. He is a man of small stature and advanced age, with combed-back grey hair, a matching moustache, and rectangular glasses, often seen wearing a white lab coat over his Team Rocket uniform.

His background is largely shrouded in mystery, with little known about his origins or how he rose to his position. He operates in a covert fashion, ordering other scientists and field agents, which suggests a high level of expertise in his field and a significant tenure within the organization, likely having climbed the corporate ladder to a rank of authority. His primary role, particularly within Pokémon Chronicles, is as a mission director for the Team Rocket duo Butch and Cassidy, assigning them tasks to capture rare Pokémon for his own research.

In terms of personality, Dr. Namba is defined by his immense pride, high intelligence, and an extremely short temper. He becomes visibly and audibly furious when people mispronounce his name, a quirk he shares with his subordinate Butch. For instance, he has been incorrectly called Dr. Samba and Dr. Number by other characters, which never fails to provoke his irritation. Beyond his vanity, he is portrayed as cunning, creative, technologically capable, and a skilled Pokémon trainer. However, these traits are overshadowed by his profound cruelty, ruthlessness, and power-hungry nature. He is an authoritative and violent individual who harbors a megalomaniacal desire for control and does not hesitate to use unethical methods to achieve his goals.

Dr. Namba's motivations are driven by a lust for power and the advancement of his unethical experiments. He speaks of a project known as the R Project, for which he demands the capture of rare Pokémon. His ultimate goal often revolves around Pokémon strength augmentation. His most notable creation in this field is the Rage Crown, a device that attaches to a Pokémon's head and stimulates the areas of the brain involved in aggression, drastically increasing its power but also driving it into a state of uncontrollable fury.

His key relationships are primarily professional, serving as a superior and taskmaster to Butch and Cassidy, who he contacts for mission briefings. He also keeps a cadre of lower-ranked Team Rocket scientists and grunts under his command. The story shows little in the way of personal bonds, as he views his subordinates as tools for his schemes.

Over the course of his appearances, Dr. Namba shows little personal development or redemption. He remains a consistently antagonistic force. He first appeared as the main antagonist of a saga focused on capturing a parent and child Lugia. Conducting his work from an underwater Team Rocket laboratory, he successfully captured both legendary Pokémon, using the child as a decoy. When his plans were foiled, he personally engaged the heroes in battle using his own Electabuzz, which was equipped with the Rage Crown. In Pokémon Chronicles, he continued his work from the shadows, giving Butch and Cassidy their objectives via recordings or long-distance communication, such as tasks to capture a specific Delcatty or Luvdisc. He resurfaces again later in the Diamond and Pearl series of the main anime, this time with the goal of capturing a Hippowdon and researching the sands it produces.

Dr. Namba also possesses notable abilities and known research fields. Besides the Rage Crown and general Pokémon strength augmentation, his research interests have included the Pokérus virus and the properties of Hippowdon’s sand. In battle, he has demonstrated the ability to command his own Pokémon, specifically an Electabuzz, and has shown a capacity for technological innovation, including the construction of a decoy Lugia to trap the real one.