Ittetsu Takeda, the 29-year-old faculty advisor for Karasuno High School's boys' volleyball club, also teaches contemporary Japanese literature. Born January 10, he stands 166.5 cm tall and weighs 59.4 kg, a stature contributing to his youthful look. His appearance features messy black hair, brown eyes, and glasses students deem unstylish; he typically wears a green track jacket over a white shirt and tie. Post-timeskip, his hair grows longer. Despite possessing no prior volleyball knowledge or experience, Takeda commits intensely to supporting the team. He relentlessly pursues crucial practice matches, persistently arranging games against schools like Aoba Johsai and Nekoma High through repeated phone calls and earnest bows. This determination revitalizes Karasuno's rivalry with Nekoma and secures vital training camp invitations. Aware of his limitations, Takeda diligently studies volleyball rules and strategies, carrying a notebook for observations and seeking guidance from players like Sugawara and experienced coaches like Yasufumi Nekomata. His commitment extends to delivering motivational speeches rich with vivid analogies and imagery, though he sometimes fears confusing the team. Speeches posing questions like "Does losing mean you are weak?" or affirming "Even this moment is still volleyball" inspire players, reinforcing themes of resilience and growth through adversity. A pivotal achievement is recruiting Keishin Ukai as official coach. After multiple rejections, Takeda persuades the reluctant Ukai using the Nekoma practice match opportunity. This evolves into a trusted partnership: Takeda manages administrative duties while relying on Ukai's expertise, occasionally light-heartedly correcting Ukai's analogies for underage players. Takeda fosters respectful bonds with other coaches, sharing drinks during camps and earning Nekomata's praise for his persistence. Takeda blends optimism, modesty, and occasional clumsiness with firmness when addressing student behavior. Though generally cheerful, he exhibits intimidating anger when provoked. Valuing the team's growth deeply, he arranges morale-boosting surprises like unveiling a cleaned historical banner before tournaments. Players like Daichi Sawamura see his presence as a blessing, while Tanaka and Nishinoya affectionately call him "Take-chan." Off the court, he cooks skillfully – his nikujaga praised by manager Kiyoko Shimizu – and humorously agonizes over his glasses' style. Over time, Takeda grows more confident in his advisory role. By 2018, he remains dedicated to Karasuno, organizing activities and supporting the team's evolution. A childhood version appears in the spin-off "Let’s! Haikyuu!?".