Kusano, often referred to as 'Kuu' or 'Ku-chan,' is a young and innocent Sekirei in the anime series Sekirei. She is known as the Green Girl due to her ability to control plants and nature. Kusano is one of the youngest Sekirei and is characterized by her kind-hearted and gentle personality. She forms a deep bond with the protagonist, Minato Sahashi, and sees him as a guardian figure. Her role in the series is pivotal as she adds a sense of innocence and purity amidst the chaos of the Sekirei battles.