Mirei Shikishima is one of the main protagonists in the anime series Valkyrie Drive. She is a strong, silent, and stoic character with a mysterious past. Mirei is known for her exceptional combat skills and her ability to transform her partner into a weapon through a unique power known as the 'Valkyrie Effect.' Throughout the series, Mirei forms a close bond with her partner, Mamori Tokonome, and together they face various challenges on Mermaid Island. Mirei's complex personality and her dedication to protecting Mamori make her a compelling character in the series.