Keigo Tatewaki, nicknamed Takki by friends, is secretary to Japan's Prime Minister within a special government organization connected to Jewel Land's magicians. His duties involve discreetly managing matters concerning the Jewelpets, preventing information leaks, and overseeing the recovery of Jewel Charms scattered on Earth. He delivers the crucial Jewel Pocketbook to Rinko Kougyoku, tasking her with awakening Jewelpets and confronting threats like Diana and Dian.

He possesses light skin, short blond hair, and ash-brown eyes. His signature attire is a light grayish-blue suit jacket and pants, a white collared shirt, a light-red tie, and black shoes. Tatewaki is proficient in martial arts and investigative research, though these skills are often outmatched by unpredictable magic. He is also fluent in English and adept at basketball.

Personally serious and dutiful, Tatewaki strictly follows his superiors' orders. Yet, he displays moments of unpredictability, such as occasional work errors or visible annoyance at the Jewelpets' antics. Despite these flaws, he consistently supports Rinko and her friends. A critical moment occurs when he nearly reveals Jewelpets secrets, leading him to become Flora's human partner. This bond deepens his commitment to protecting both the human world and Jewel Land.

His surname, Tatewaki, translates to "sword," reflecting a thematic element. Alternate surname renderings like "Taitō" or "Tatewaki" appear across sources, but his role and background remain unchanged. His narrative arc is primarily featured in the anime's first season.