Kōki Takeda is a 27-year-old male sales employee at Sunlight Beverage. He has brown hair cut to his ears and green or olive eyes, born on July 19th under the Cancer sign with blood type A. His surname Takeda (竹田) combines "bamboo" (竹) and "field" (田), while his given name Kōki (浩輝) means "prosperous" (浩) and "radiance" (輝).

He works alongside Tatsuru Miyazumi and Mikoto Shiratori and competes on the company's corporate badminton team. As a doubles player, his partner is Tōya Saeki. Takeda actively promotes their duo as the "Taketo Pair," blending their surnames: [Take]da and [To]ya.

Takeda possesses strong communication skills and typically displays a cheerful, good-natured demeanor, aiding his sales role. However, he experiences significant performance anxiety during high-pressure situations like badminton matches or work presentations, especially before large audiences. This stems from a traumatic high school incident where he publicly confessed feelings to a crush during an open-mic event, believing his feelings were returned, only to discover she was interested in his best friend. The profound embarrassment instilled a lasting fear of public scrutiny.

To manage this anxiety, he employs the psychological strategy of imagining the audience in a vulnerable state, such as naked, helping him regain composure. Despite this, his performance anxiety persists, fueling feelings of inadequacy. These insecurities once led him to believe he hindered Tōya's performance, prompting him to temporarily step away from playing and transition into a coaching role. During this period, Tōya formed a new doubles partnership with his brother, Sōta Saeki. Takeda later returned to active competition.