Sena Riko also known as the "Savage Sister" is the older sibling of the notorious Sena Sisters. Riko is a 20-years old girl very muscular big girl with blond hair, she is also very tall, around 184cm with weight 83kg. Riko's fighting style is characterized by her sheer brute strength and combat instincts. Riko, despite her brutish demeanor in combat, is one of the friendliest members of Valkyria. Riko is simple minded and literal-minded, not smart. Riko is underground fighter under Valkyria.