Pleiades Seijin is an enigmatic alien character in Houkago no Pleiades (Wish Upon the Pleiades). She appears as a mysterious guide connected to the Subaru girls’ journey and the magical, space-themed story. Calm and otherworldly, she helps frame the series’ central themes of friendship, growth, and reaching for the stars. As a symbolic presence rather than a conventional main character, she contributes to the show’s dreamy atmosphere and the unfolding of the protagonists’ emotional and cosmic adventure.