Rallen is the main protagonist of the Spectrobes series. He is a Spectrobe Master and junior officer of the Nanairo Planetary Patrol. His main allies are Jeena, his partner, Aldous, and Commander Grant. Rallen is known for his bullheaded, prideful personality and tendency to get carried away. Rallen's catchphrase is, "Let do this, Iku ze!" which means "Here we go!"/"Let's go!" Alternatively, he says, "Let's do this, Honki de iku ze!" which translates to "Let's go all out!" or "Let's go for real!"