Serpo Seijin is a recurring alien character in the manga series 'Dandadan.' As a member of the mysterious Serpo alien race, Serpo Seijin stands out for his peculiar appearance and eccentric personality. He is often involved in comedic and bizarre situations, serving as both an antagonist and a source of comic relief. His interactions with the main characters reveal the strange and unpredictable nature of the universe within 'Dandadan.' Serpo Seijin’s unpredictable motives and unique abilities make him a memorable presence in the series.