The Yumegaoka Detective Boys (夢が丘少年探偵団 Yumegaoka Shōnen Taitedan?) * Kakeru Yukiyanagi (雪柳 カケル Yukiyanagi Kakeru?): Robotack's first human friend and the leader of the YST. He plays the Wonder Flute and supports Robotack. Because his parents reside in London, he is under the care of Sugi. He left Yumegaoka for London. * Kōta Umeda (梅田 コータ Umeda Kōta?): Kakeru's classmate and a mood maker of the YST. * Shigeru Sakaki (榊 シゲル Sakaki Shigeru?): Kakeru's classmate and a member of the YST. He had a trauma due to Chinese dumplings. * Misaki Tachibana (橘 ミサキ Tachibana Misaki?): Kakeru's classmate and a member of the YST, though technically the only female member.