Seira Yume is a main character from the 'Robot Neoanthropinae Polynian' multimedia franchise, which features action figures, manga, and other media centered around humanoid robots called Polynians. Seira is known for her cheerful and energetic personality, often acting as a central point in group dynamics. As a Polynian, she embodies the concept of a 'dreamer' and seeks to understand both humans and robots. Seira plays an important role in conveying the themes of coexistence and self-discovery throughout the series.