Nina Tachibana

Citrus
Nina Tachibana is one of the supporting characters in the 2012 yuri manhga Citrus and the anime adaptation.

Despite her tall appearance, Nina is actually the younger sister of Sara. Sara is more down-to-earth in comparison to her sister who is a form believer of superstitions. After she ended up getting separated from her sister, Nina learns that Sara had developed a crush on a dark-haired girl who had helped her at the train station. Deeply caring for her sister, Sara tries to ensure that Sara ends up dating Mei at any cost. She even resorts to using manipulation to make Yuzu the less wiser, and stands directly in her way when Yuzu was trying to intervene with the date between Sara and Mei. However, Nina realizes the error of her ways when Sara willfully ends the date on her own terms. Sara reassures Nina that she was doing the right thing, and Nina relents.

Nina is last seen offering to take Yuzu out to eat whilst sharing everything she knew about her sister so that her sister and Mei could have some time to reflect over the whole date.

Personality
Sara is a smart girl who does make exceptional grades in school. Unlike her sister, Nina doesn't believe in any of those superstitions, only that you alone can make your own choices. Despite being relatively more mature than her older sister, Nina still has moments where she is outlandish or acts impulsively. Despite her flaws, she truly does care for her sister and she saw Sara developing a crush on Mei as the only way that her sister could earn true happiness even at the cost of preventing Yuzu from admitting.

It's also implied, but not outright stated, that the love Nina has for her sister extends beyond platonic feelings, which could explain why she was so bent on getting Sara someone to love.