Kai Schulen is a prominent character in the anime series Senjou no Valkyria, also known as Valkyria Chronicles. Originally known as Leena Schulen, she takes on the identity of her brother, Kai, to continue his mission after he disappears. Kai is a skilled sniper and a key member of Squad E, where she uses her sharpshooting skills to support her comrades in battle. Her character is defined by her strong sense of duty, loyalty to her squad, and the personal burden she carries due to her brother's absence.