Takeshi Toyama competes on the water polo team at Rikka Gakukan high school, occasionally called Rikka Academy. He possesses a wide-framed yet lean build, fair skin scattered with freckles, and cedar-toned hair. This hair is shaved on one side, styled in deliberate disarray, and accented by a single dyed pale blond strand. His clothing consistently favors relaxed, comfortable aesthetics.

Personality-wise, Takeshi exhibits a high-strung and prideful nature, often disregarding instructions. Despite this, he demonstrates unwavering respect toward his friends. He plays water polo for Rikka Academy alongside teammates including Akihisa Fukui and Norimichi Ishikawa.

The name Takeshi (健) translates to "healthy, strong," while his surname Toyama (富山) merges the characters for "wealth, abundance" (富) and "mountain, hill" (山).