Kosaki Onodera

Height: 157 cm

She is one of the main characters in the manga series Nisekoi. She is shown to have a crush on Raku Ichijou, the male protagonist of Nisekoi, and is also the only girl that Raku openly has feelings for.

Kosaki is discreet, innocent, and slightly timid. She is very kind, she takes care of Raku when he is wounded or ill. Generally, she opts to think carefully before acting, as seen when she stalls her confession to Raku in consideration that he may have feelings for Chitoge.

In confrontation with Raku, Kosaki displays inconfidence, initially needing encouragement from Ruri attempt confessing her love.

Kosaki works well with her classmates, possessing close friends and being the most popular girl for the boys before Chitoge transferred and after Kosaki and Raku allegedly began dating.

Both Kosaki and Raku are completely unaware that the feelings they hold for each other are mutual. Like in many average fictional love stories, these two try not to show their feelings to each other. She loves Raku because he is kind and caring. Just like the other girls who like him, she can be jealous as well but not to the point of having bloodlust. She often worries/wonders whether Raku and Chitoge's "fake relationship" is actually developing into something more than just that.

Chitoge and Kosaki have a really trusting relationship. It can even be considered that they are best friends since Chitoge only tells her problems to her (except in some cases, Raku as well). Despite her knowing that Chitoge and Raku are only pretending to date, she at times can't help but be suspicious of their relationship.

~!In the end of the manga, Kosaki is revealed to be The Promise Girl, who had made a promise of marriage with Raku when they were young.!~

(Source: Nisekoi Wikia)