Yuzu Aihara (藍原 柚子,Aihara Yuzu?), née Okogi (小此木,Okogi?), is the main protagonist in the manga Citrus. She has a younger stepsister, Mei Aihara, who moved into her house after her mother married Mei's father Shō Aihara.
Yuzu is a very pretty girl with dyed chestnut blonde hair. She has emerald green eyes and has two piercings in each ear. She is very fashionable and keeps up with the latest trends. Her natural hair color is brown, and during the 17th and 18th chapters of the manga, she temporarily wore a jet black wig.
Yuzu is a self-proclaimed gyaru. She is a daring, outspoken, and an often shameless girl who enjoys dressing up, wearing make up and customizing her school uniform, which clashes with her school's rules, often leading into problems with the Student Council. She emphasizes on what relationships have to be like to cover up her own inexperience of them. She attempts to be as girly as possible and detests the academy's no make-up policy. From the beginning of the manga she is portrayed as a "dumb blonde", yet slowly as the manga progresses her more domestic and caring attributes are manifested. She is a creative cook and often will cook for herself and Mei when their mother is busy working.
Despite her attitude, with hard work, she is shown to be able to get good grades in tests. Despite Yuzu acting like a child at times, she does her best to make the people she cares about happy. She is considerate, yet clumsy and brash. She is incredibly bubbly, and her optimistic side often manifests itself in her conquests for Mei. She cares not for school rules or upper-class views, and she's more interested in what society on a whole thinks of her.
After finding real love she became considerably happy about it wanting to show her affection more. However, she found out the hard way that not everyone will approve of her relationship with Mei, leading her into a state of depression and resulting in failing her exams. It wasn't until she got encouragement from Mei that she snapped out of it.
When she got her phone back from Mineko she try's to hiding it in her chest as Harumi did with hers but failed.
In the anime, she runs past Harumi after seeing Mei and Amemiya.
Yuzu helps her mom unpack and goes grocery shopping with her when after she gets home, this doesn't happen in the manga.
In the manga, her hearing about Mei's life before she moved in with them takes place at the mall, but in the anime it takes place at home.
Yuzu was the one who gave Mei the stuffed bear keychain in manga, while in the anime Shō was the one who gave it to her.
Her first kiss with Mei was more drawn out in the anime than the manga.
In the manga, when Yuzu and Harumi discovered Amemiya's true intentions, they were hiding behind bushes, while in anime they were hiding behind cars in the school's parking lot.
In the manga, Yuzu unconsciously followed Mei to her Grandfather's house, while in the anime she find it by chance when trying to return Mei's bag.
In the anime when Yuzu wanted to confront chairman she went to his house first,while in the manga she went straight to his office.
In in the anime at home Yuzu saw the teddy bear keychain had a tear and was badly sewn she decide fix it, while in manga it takes place at school and the stuffed bear keychain originally belonged to Yuzu ,As She runs away from Himeko, she accidently drops Anthoniko, causing him to tear a bit. Mei finding him, picks him up and tells Yuzu to wait. Distracted by this, Yuzu hits the wall, being sent to the infirmary for a bruised forehead. Mei tries to fix Anthoniko, but it is revealed that she is not good at sewing, so instead Yuzu fixes him as Mei leaves. Yuzu says Anthoniko said "thank you". Being touched by that, Yuzu decides to let Mei have him.
"Yuzu" (柚子,"Yuzu"?) is the name of a citric fruit, which is possibly the reason why the name of the manga is Citrus.
"柚子" can be also be read as "Yuzuko", as "柚" is read as "Yuzu" and 子 is read as "Ko". However, it was confirmed by Saburo Uta on her twitter that the correct reading of her name is indeed "Yuzu". It is also confirmed in each volume/chapter's character list.