Ittetsu Takeda, Karasuno High School’s boys’ volleyball team advisor, balances his role as a modern literature teacher with unwavering commitment to the team. At 29, his 166.5 cm frame clad in a green track jacket, white shirt, and black tie—later replaced by a spotted design—belies a youthful energy accentuated by messy black hair, brown eyes, and glasses. Post-timeskip, his hair lengthens, yet his earnest demeanor remains unchanged. Though initially unfamiliar with volleyball, he compensates with relentless dedication, scribbling strategies and rules in a well-worn notebook gleaned from players and mentors. Appointed advisor shortly after joining Karasuno, Takeda orchestrates the team’s resurgence through sheer tenacity. He secures pivotal practice matches against powerhouses like Aoba Johsai and Nekoma via relentless outreach, then persuades tactician Keishin Ukai to coach, cementing Karasuno’s revival. Their partnership thrives on mutual respect: Ukai’s technical prowess intertwines with Takeda’s logistical precision and emotional acuity, forging a dynamic that propels the team forward. Optimistic and humble, Takeda punctuates interactions with deep bows of gratitude or apology, endearing him to students. His calm authority surfaces in rare moments of quiet intensity, commanding attention without raised voices. He motivates through poetic metaphors, though he frets over their impact—doubts swiftly dismissed by players like Daichi Sawamura, who cherishes his steadfast presence. Beyond administrative duties, Takeda prepares meals praised by manager Kiyoko Shimizu, embodying his holistic support. His sparse yet supportive family background hints at influences shaping his altruism. Years later, he remains a constant through Karasuno’s national-stage triumphs, while a youthful cameo in the spin-off "Let’s! Haikyuu!?" playfully alludes to his past without elaboration. Takeda’s evolution mirrors Karasuno’s ascent: from novice advisor to strategic architect, he brokers alliances with rivals like Nekoma’s Yasufumi Nekomata and orchestrates training camps. His growth underscores the silent force of adaptability, perseverance, and behind-the-scenes dedication—cornerstones of collective triumph.