Ken Wakashimazu, internationally known as Ed Warner, is a Japanese football player uniquely skilled as both goalkeeper and forward. His karate background profoundly shapes his aggressive "Karate Keeper" style, integrating martial arts into goalkeeping saves, clearances, and forward play techniques. Starting at Meiwa Elementary School, he forged a potent attacking partnership with Kojiro Hyuga. Responding to the team's defensive needs, he transitioned to goalkeeper, establishing his dual specialization. A car accident sustained while rescuing a dog caused a left-side injury that later impacted his performances yet underscored his determination. Transferring to Toho Academy with Hyuga, he faced paternal pressure to quit football and inherit the family karate dojo. A pivotal agreement was struck: winning the national tournament meant he could continue football; losing meant focusing on karate. This drove his resolve during critical matches, including the national final against Nankatsu SC. Despite aggravating his injury in a collision with Tsubasa Ozora and conceding to the Drive Shot, his tenacity helped secure a joint championship victory, preserving his football career. He served as Japan's primary goalkeeper in U-15 and U-19 tournaments. His rivalry with Genzo Wakabayashi intensified during the World Youth arc after a 6–1 loss to Hamburg SV, where Karl-Heinz Schneider exploited his injured hands, prompting Wakabayashi's return as a consultant and internal competition for the starting spot. In the U-16 World Cup semifinal against France, he stopped Louis Napoleon's Cannon Shot in a penalty shootout, but his reopened hand injury forced him to cede the starting role to Wakabayashi for the final. After high school, he became the first of Japan's "Golden Generation" to join the J-League, signing with Yokohama Flugels. He later departed the U-23 training camp due to disagreements over Wakabayashi's perceived preferential treatment, dramatically catching Hyuga's Tiger Shot single-handedly during an argument. He subsequently transferred to Nagoya Grampus. A significant tactical evolution occurred when the U-23 coach repositioned him as a forward to leverage his physicality and karate skills, enabling him to play alongside Wakabayashi. This capitalized on his aggressive aerial ability and ball control, enhancing Japan's attack. His karate foundation remained central, facilitating acrobatic saves, powerful clearances, and unique striking. His international contributions include notable performances in Olympic qualifiers and matches, such as denying Brian Cruyfford's shots in a friendly against the Netherlands.