Wakaba Kutsuki serves as Futaba Kutsuki’s younger sister and a recurring supporting figure throughout the Green Green franchise. She unfailingly addresses Futaba with deep reverence as "onee-sama." Her defining characteristic is carrying Togemura, a potted cactus she treats as a sentient companion, holding conversations with it as though it responds. Wakaba employs Togemura for fortune-telling and wields it defensively to shield herself or allies.

Personality-wise, she radiates a simple-minded, friendly, and outgoing demeanor. She embraces her time at Kanenone Gakuen with optimism, opposing her sister’s initial reluctance. Wakaba’s naivety and gullibility lead her to follow instructions unquestioningly, and she lacks conventional modesty—traits causing unintended impropriety, such as mistaking insect bites for venom. She holds a profound admiration for flowering plants.

Her background remains largely unexplored. She appears as a side character in the visual novel *Green Green 3 ~Hello, Good-bye~*, consistently accompanied by Togemura. Across all official media—including the TV series, the OVA *Green Green Thirteen: Erolutions*, and visual novels—her minimal character development adheres strictly to these established traits.