|Aliases|| Lovely Young Lady|
|Physical and Vital Information|
|Date of Birth||December 6th|
|Relatives|| Unnamed mother|
|Game||Prologue Queen's Shadow|
|“||Um, after so much styling practice, I've come to the conclusion that it's not merely about having a good appearance, it's... well, it's also about helping people to face everything with a more enthusiastic, positive image!||”|
Nikki is the title character and the protagonist of the game. She dresses up in different styles to win stylist battles as she travels across seven different nations with different styles. Momo, a small talking cat, is her sidekick.
Nikki's appearance often changes as a result of her being a stylist who participates in style battles.
Her normal appearance is that of a fair-skinned teenage girl with long pink hair that reaches her waist with navel-length forelocks and straightened bangs that have a small split in the corner. Her warm, gentle eyes are amber with a hint of pink and gold.
Her casual attire consists of a white and pink floral lace dress, white socks, and pink heart heels.
Pure and very thoughtful, Nikki is a gentle, peaceful, somewhat clumsy girl who has a tendency to attract the attention of others–either because of her sweet nature or her talent. She is very patient and understanding, and often has great fashion advice. However, she appears to be modest and possibly a little less confident than most.
Momo is Nikki's pet cat. Momo is hard on Nikki and often critisizes her or claims she is helpless or clumsy, but it is clear that he believes in her and is pushing her to do her best. She cares about him in return.
Due to her lively personality and friendly nature, Nikki and Bobo became fast friends. They appear to share a lot in common.
The duo have a friendly rivalry with each other. Kimi views Nikki as a stylist with great potential and entourages her to grow and improve her skill. She becomes one of Nikki's strongest supporters and helps her practice her styling before contests.
There are hints and speculation that Kimi has romantic feelings for Nikki. In some item descriptions they describe Kimi as preferring Nikki over Joe, and she is shown getting flustered during the Valentines Day event and denies it meaning anything.
It is often noted by others how much they look alike, although they are not related. Nikki cares a lot for her and, when she's almost kidnapped in the Celestial Pavillion, Nikki decides to take her place and helps fend off her attackers.
- "How about we give it a shot? Only by undertaking more challenges can I become a designer who Kimi approves of!"
— Nikki in 6-1 Challenge Flower Field.
- "...Isn't here a world where all disputes can be solved by style contest? Why... there are killing and death here..."
— Nikki in 15-9 Compete with Nidhogg.
- Nikki's Chinese name means "warmth".
- Nikki is the feminine diminutive form of Nicolas or Nicole, which comes from the Greek Nikolaos (Νικόλαος), a compound name composed of the elements nikē (victory) and laos (the people): hence, "victory of the people."
- In Japanese, the word nikki (日記) means "diary".
- Nikki is said to live with her mother, her elder sister Nina, and Momo on Earth.
- In Love Nikki, Nina is localized as Yoyo.
- In the previous games developed by Nikki CO., Nikki Up 2U 2, it was hinted that her family name is Su (苏), which resembles Suzhou (苏州), the city where the development team first gathered for the game NikkiUp2U.
- It is said in the previous sequels that her hobby is folding paper (origami), which resembles the company's formal name Paper CO. Also it was hinted that she is a rising college student.