Ultraman Ruebe is a fusion Ultraman from the series Ultraman R/B, formed when brothers Katsumi and Isami Minato combine the powers of their respective R/B Gyros and crystal elements. He serves as a powerful final form and a symbol of the brothers’ unity, appearing when they synchronize their hearts and resolve. Ruebe is a heroic protector who battles major threats to Earth, representing the culmination of the series’ themes of family bond, cooperation, and overcoming conflict through trust.