Announcer Yoshigai serves as the primary play-by-play announcer for wrestling matches throughout the Kinnikuman franchise, including its sequel series. The character draws direct inspiration from Yoshio Yoshigai, who was a real-life neighbor of Yudetamago, the manga's creative duo. His visual design and hairstyle were significantly altered for the original anime adaptation compared to his appearance in the source material.

Yoshigai maintains a consistently professional and serious demeanor in his role as a commentator. This straight-laced personality is often tested by the antics of his broadcasting partners. He makes his debut during the 20th Chojin Olympics arc, where he is paired with the color commentator Tazahama. Throughout this tournament and the subsequent 21st Chojin Olympics arc, Yoshigai remains the lead announcer, steadfastly performing his duties while enduring Tazahama's wacky jokes and unpredictable behavior.

His role as the consistent voice of Choujin wrestling continues into the sequel era. In Kinnikuman Nisei, he still provides commentary but now works alongside a new color commentator named Nakano, whose erratic and whimsical style he is also forced to tolerate during broadcasts. His presence extends to related media, as he appears in the film Kinnikuman Nisei: Second Generations at a fan appreciation event. The character's long tenure establishes him as a recognizable fixture of the franchise, though he is temporarily replaced by Announcer Sekiguchi during the Scramble for the Throne story arc before resuming his regular duties. While no specific superhuman abilities or fighting techniques are attributed to him, his notable skill lies in his unwavering professionalism, as he reliably provides play-by-play coverage for major wrestling events across multiple generations of Choujin competitors.