Futaba Kutsuki begins as a tomboyish character harboring a strong aversion to males, actively positioning herself as a self-appointed protector for the female students during Kanenone Academy's co-ed trial program. She exhibits classic tsundere traits, combining a short-tempered, rebellious exterior with underlying vulnerability, and displays overt misandry, particularly targeting the "Baka Trio" for their perverse antics. Physically, she possesses violet shoulder-length hair, red eyes, and a slim build, typically seen in her school uniform or practical clothing like tank tops and shorts.

Her background includes a close, protective relationship with her younger sister, Wakaba Kutsuki, who deeply respects her, referring to her as "onee-sama". Futaba's hostility intensifies after a humiliating prank by the Baka Trio, causing her to flee the academy alone. This leads to her becoming lost and injured in the surrounding woods.

A pivotal shift occurs when Yuusuke Takasaki saves her, carrying her back to safety. This act of kindness, following an earlier instance where Yuusuke defended her modesty, sparks her initial romantic feelings for him, marking a significant departure from her previous antagonism.

Across the series and OVAs, her relationship with Yuusuke becomes central. In "Green Green: Erolutions," set after the girls leave Kanenone, Futaba maintains contact with Yuusuke through letters. Despite Yuusuke's lingering attachment to Midori Chitose, Futaba's persistent affection eventually results in them becoming a couple by the OVA's conclusion. Her arc transitions from fierce independence and hostility toward embracing vulnerability and romantic commitment.

In spin-off media like the "Green Green Character DVD," Futaba features in dedicated content alongside characters such as Chigusa Iino, including short stories and untelevised scenarios.