EX Man B belongs to the trio called the Excusemen, often dubbed "The EX-men." This group serves as an Exposition Greek Chorus, directly speaking to the audience throughout the original series, its second season, and the *Seven Spirits* continuation. They facilitate scene transitions by rolling viewer screens while delivering their signature catchphrase, "Ex-kyu-su~Mii~."

Identified as the blue member, EX Man B wears Opaque Nerd Glasses, contributing to his scholarly appearance. Within the trio, he consistently appears as the most intellectually adept, frequently supplying detailed explanations during significant narrative points. EX Man B and the group specifically intervene during battles or item usage to deliver Exposition Breaks—clarifying the mechanics behind Wataru's Status Buff items or special weapons to aid audience understanding. This occurs most notably when these elements first debut.

His role remains consistent, showing no documented evolution or expanded backstory across films, OVAs, or spin-offs. The Excusemen, including EX Man B, were ultimately replaced by the Haniwaman family in *Super Mashin Hero Wataru*.