Mamori Tokonome is a central character in the anime series Valkyrie Drive. She is a young girl who finds herself stranded on Mermaid, an isolated island where women are capable of transforming into weapons. Mamori herself is an 'Exter,' meaning she can transform into a weapon, but she initially struggles to understand her powers. Throughout the series, she learns to embrace her abilities with the help of her partner, Mirei Shikishima. Mamori's character explores themes of self-discovery and empowerment as she navigates the challenges of the island and uncovers her own potential.