Kyōichi Teshigawara, universally called Tesshi, acts as assistant to Tsuyoto Hiiragi and manages the Shōnen Hollywood idol group at Hollywood Tokyo, overseeing daily practices while nurturing the members' growth.

Tesshi's roots with Hollywood Tokyo stretch back before the original Shōnen Hollywood's fame. He supported the founding members throughout their career and stayed at the theater following the president's sudden death and the group's abrupt peak disbandment. After the split, Tesshi remained with Cat, attempting to scout new idols on his own, though none gained notable success. Roughly 15 years later, he joined forces with Tsuyoto Hiiragi to launch the new Shōnen Hollywood generation.

Tesshi embodies nurturing loyalty. He prioritizes the well-being of past and present members, functioning as a motherly figure who attends to their practical and emotional needs. This care extends to former members, shown by his concern for Ryū's location before learning Ryū was safe at Castle Resort Land. Tesshi holds enduring affection for Shōnen Hollywood's legacy, visibly happy whenever original members return to the theater.

His dedication to Hollywood Tokyo persists across realities. In the stage play narrative, where the original group stayed together and the president lived, Tesshi supports them alongside the president. Conversely, the anime unfolds 15 years after the original disbandment, where Tesshi assists the new members with the same devotion he gave their predecessors. He considers his loyalty to Shōnen Hollywood eternal, transcending generational shifts.