Glieger is an alien ally who assists Wonder Momo in defending Earth against the Warudemon invaders. He previously aided the original Wonder Momo during past Warudemon invasions and remained on Earth afterward. When new threats emerge, Glieger returns alongside his companion Glooder to support the current generation of heroes.

He sports a bald head and black eyes, fulfilling a leadership role that emphasizes strategy within his partnership. Glieger is depicted as more intelligent and authoritative than Glooder, taking command of their combined efforts against the alien menace. His background includes mentoring the original Wonder Momo, a role he continues with Momoko Kanda, the new Wonder Momo, supporting her in battles across official adaptations.

In the webcomic continuity, Glieger's history confirms his long-term residence on Earth and his ongoing commitment to protecting the planet from Warudemon resurgence. His actions consistently focus on guiding and empowering the human heroes facing these extraterrestrial threats.