Amane Suzuki, Natsuki's younger cousin, is a second-grade elementary student with an amiable, honest, and gentle disposition. Her reliability strengthens group dynamics despite early friction with Natsuki. Amane initially blames Natsuki for Pyon-Kichi's escape and perceives her cousin as increasingly arrogant and lazy after moving in, creating tension between them.

This conflict dissolves when Neppo's forces kidnap Amane during a Zughan root incident. Rescued by Natsuki, Amane discovers Neppo's henchmen caused Pyon-Kichi's disappearance, leading to genuine forgiveness and reconciliation.

Throughout their interstellar journey, Amane's consistent gentleness shines through her concern for others, particularly during Pyon-Kichi's absence and the group's search efforts. Her sincere emotional honesty fortifies group cohesion amid cosmic challenges. Amane's narrative role centers on her restored bond with Natsuki and her unwavering kindness in extraordinary circumstances.