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 colour 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 often shameless girl who enjoys dressing up, wearing make up, and customizing her school uniform, which clashes with her school's rules, often leading to problems with the Student Council. She emphasizes what relationships have to be like in order to cover up her own inexperience with 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 will often 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 on 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 as she's more interested in what society as 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 tries to hide it in her chest as Harumi did with hers, but fails.
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 finds it by chance while 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 the anime at home Yuzu saw the teddy bear keychain had a tear and was poorly sewn, so she decides to fix it, while in manga, this 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 finds him, picks him up, and tells Yuzu to wait. Distracted by this, Yuzu hits a wall and is sent to the infirmary for a bruised forehead. Mei tries to fix Anthoniko, but it is revealed that she is not very good at sewing; instead, Yuzu fixes him as Mei leaves. Yuzu says Anthoniko said "thank you." Being touched by the gesture, 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.