Kotegawa Yui

Yui Kotegawa is a secondary female protagonist of To Love-Ru who is in Rito's class during the second year. She is the head of the school disciplinary committee and episode 8's main antagonist.

A common gag is that newer characters cannot remember Kotegawa's family name. Calling her "kokegawa" instead presumably due to the fact that she is generally an unwilling participant in Lala's frequent schemes.

Appearance
Yui has long black hair and dark brown eyes, she is often seen with an angry or unpleasant face. According to Mio Sawada, her measurements are B88, W59, H87, an attractive figure compared to other students (something that other characters like Nana and Haruna feel jealous towards to), which is surprising and ironic considering her rejection of sex and courtship.

Personality
Yui Kotegawa is an high-strung and uptight girl, she has little to no tolerance for anything perverted, people who bring personal items to school, or whatever she does not consider to be "acceptable behavior". Her opinions, quick temper, and habit of speaking her mind often results in her vocally reprimanding classmates. Yui quickly grows annoyed and disgusted by eccentricities and bizarre actions, especially with regards to Rito and Lala.

Unfortunately, almost every encounter with Rito usually ends up with her embarrassed, naked or groped, and although her nature prevents her from easing her behavior, she does slowly warm up to his usual antics. After Rito saves Yui from a group of delinquents, she develops feelings for him. Her inexperience with boys leaves her unable to understand her own feelings and continually denies them to herself.

When Rito usually asks what's wrong, she says the exact opposite of what she wants to say and then yells at him in some way (a typical Tsundere), she tends to blush whenever someone mentions him and also thinks about him through something irrelevant like when Risa asked if she had anyone she likes or him complimenting on her yukata or even when seeing Riko. For some time now she has come to realized that she is in love with Rito, a fact she is annoyed about given her opinion of him. Deep down (despite being strongly against lewd things) she actually desires to do this things with him, one time during one of Rito's accidents she offered herself to him, on the condition that he would only ever do it with her (To-Love-Ru Darkness Chapter 4). She has been seen fantasizing about being together with him, as his wife and pregnant with his child.

She also really likes cats – owning cat based books, having tons of stuffed cat dolls which she decorates her room with along with other cat shaped things, shaping her Valentine chocolate into a cat's face, and even having a cat-themed floaty, something Rito seems to find cute about her. She would secretly go to pet stores to look at cats, she would get embarrassed if anyone were to find out about this.

History
In her childhood Yui despised all boys because of how violent, insensitive and above all shameless they can be and stated that they caused her much hardship as a class rep in 5th grade and she would try to protect girls from boys who would do these things to them, because of this she thinks that any kind love and romance is shameless since it meant being close with a boy. Her view of this changes slightly when she initially first met Rito when she saw him willingly saving a cat from a tree, the same cat she was unable to save and no other boy she asked even cared (although it was a few years later during a deja vu that Yui remembered this event and Rito's being in it. Rito probably isn't aware that Yui was that same girl he met, it's unknown if he still remembers her). Yui had the impression that all boys are bad but because of Rito's bravery and kind nature, her impression of this changes and realizes that not all boys are bad (but still finds most of them shameless, even Rito but understands very much that it's not really his intentions).

Relationships with Other Characters
Rito Yuuki Originally thinking he was just another "Shameless" boy, she realized how wrong she was. Her feelings for him began to change to move towards romance when Rito saved her from a group of delinquents. Throughout the series, Yui's love interest in Rito developed. Yui made chocolate for him on Valentine's Day, even though she claimed it was just "Giri (Obligatory) Chocolate," she really made chocolate only for him. In the OVA, at a group picnic, Yui told Rito "I won't let you do shameless things with anyone else but me!!" while she was under the influence of pollen that caused everyone to freely speak their minds.

In To Love Ru: Darkness, while Momo is trying to further her Harem Plan, she manipulated Yui and Rito into being alone together at Rito's house during what appeared to be a rain. During a black out, Rito falls onto Yui. While Rito is on top of her on his bed, Yui puts her arms around him and explains how she has learned to accept that it's normal for boys to be shameless, and that they are not all bad. She then offers herself to him if he agrees to do shameless things only to her (chapter 4). Rito breaks away and explains to her that although he is interested, he doesn't do shameless things on purpose. Yui falls further in love with Rito as she sees his innocent nature and how he is different from what she perceived all boys to be. She surprised herself with what she was doing and how far she went, and is grateful to Rito for not taking advantage of her.

After a little longer she comes to realize that she loves him. Although she still has to put up with a lot of his clumsiness, she knows most of all that he is not a boy who would intentionally disrespect girls or take advantage of them. When Momioka playfully and dishonestly explains her sexual experience with Rito, Yui knows immediately that it was not true, remembering Rito could have done it with her when they were in his bedroom but didn't, and thinks to herself that he is indeed different from other boys, and that he is special. Yui would prefer for Rito to be more responsible for his actions, she even mentioned that because he is careless, he brings shameless incidents upon himself.

While Rito does not have any romantic feelings for Yui, and thinks that she is always angry at him, any romance between them is generally seen from Yui's perspective. Her growing love for Rito surprises even herself. However, being inexperienced with boys and being a typical tsundere, she has difficulty opening up to Rito and often hides her shyness with aggression and anger.

Lala Satalin Deviluke While Yui is generally very uptight, and in some senses Lala's complete opposite, she still is her friend. Lala's outgoingness with Rito often leads to Yui considering it "Shameless," however it has become a norm with her. Yui shows a slight jealousy towards how close she is with Rito, but strongly denies it herself.

While Lala likes to consider everyone to be her friends, Yui and Lala don't generally bond with each other personally.

Yuu Kotegawa
Yuu is Yui's older brother and a lady's man, which is something that Yui dislikes about him. Yuu is aware of Yui's love for Rito, which she denies. He is eager to see his sister grow to become more mature and acknowledge her love for Rito.

Risa Momioka and Mio Sawada
There is little evidence that Yui is explicitly friends with Risa and Mio. Because they are always groping other girls, talking about sexual subjects, and just being "shameless", Yui would naturally reprimand them to stop being so shameless, which is clearly not well heard by them. It does not help that Yui has a surprisingly attractive figure, which they pointed out as having a pretty "shameless" body herself. They would occasionally grope her body as well, like they would to other girls.

Because of how Risa appears more frequently, she practically annoys Yui the most, because of how she always comments on how mischievous she can be and how she would say something about a situation would lead to a perverted one, mostly involving Rito. She even lied  to her about having done something "shameless" with Rito.

Celine
Celine has shown a possibly strong liking to Yui, as pointed out by Rito when she hugged her. Yui was once mistaken for being Celine's mother and in a way as Rito's wife to which she greatly denies, because of this Yui would sometimes have day dreams about the three of them as a family (at the same time being pregnant with Rito's child). On some occasions Yui gives Celine cat based books to read and sometimes she is seen reading to her at school.

Trivia

 * Kotegawa has a cameo in Mayoi Neko Overrun! (Chapter 4, Page 33).Mayoi-neko-overrun-1321602.jpg
 * Like many other anime girls (and some guys), Yui entered   Saimoe Contests.
 * ​To see her result, visit here:   http://saimoe.wikia.com/wiki/Yui_Kotegawa
 * To vote for her when the match is on, visit here:   http://www.internationalsaimoe.com/voting/