Riko Sena and Riku Sena, also known as the "Psycho Sisters" in women's fighting arena. They're absolute beasts in the fighting ring but normal people outside the ring. Riko is the oldest, she is 184 cm tall and weighs 83kg in pure muscle, she's a Tall and muscular woman in her early or mid 20s, she's very calm, relaxed, flirty, dumb, Laid-back. Riku is the youngest, she is 170 cm tall, she's a athletically muscular woman, she is 18 or 19 years old, she is mean, rude but can be sweet and chill.