Taichi Nakanishi is a goalkeeper defined by his imposing stature and unexpected agility. He debuts in the Kids’ Dream arc, commanding attention as Naniwa FC’s starting goalkeeper during the 6th All-Japan Boys’ Football Tournament, positioning himself as a rival to Genzo Wakabayashi. His confidence falters when Tsubasa Ozora strikes a goal from beyond the penalty area, sealing Naniwa FC’s 5-1 loss to Nankatsu SC. Though ranked the tournament’s third-best goalkeeper, the defeat underscores his gap compared to Wakabayashi. In middle school, his team’s bid for nationals collapses in the Osaka prefecture finals against Azumaichi MS, spearheaded by Makoto Soda. He later joins Tatsunami High School, clashing with Kojiro Hyuga’s Toho Academy in the National High School Tournament. During the Golden-23 arc, he is rostered for a friendly against Denmark but remains benched, failing to secure a spot on the Olympic team. The Rising Sun arc places him as a spectator during Japan’s clash with Germany before he temporarily fills in for injured national teammates. His role evolves in the U-13 International Tournament as a third-choice goalkeeper, though training sessions reveal his occasional deployment as a sweeper-defender. Video game portrayals highlight his blend of physical power and observational skills, featuring him as a playable character in *Captain Tsubasa: Rise of New Champions* and across Tecmo titles for Tatsunami High School, Toto University SV, and Japan’s Asian Cup squad. Later arcs see his development stagnate, with sparse chances to advance despite fleeting national team inclusions. The Golden-23 Denmark friendly becomes a missed opportunity to demonstrate his abilities, as he remains sidelined. Trivia notes his international alias variations—Theo Sellers in Europe, Borjini in Latin America—and a visual quirk of tongue protrusion, reminiscent of mascot Peko-chan.