Kotegawa Yui

Yui Kotegawa is a major character in the To Love-Ru anime and manga. She is the prefect of Rito Yuuki's school and is very strict about the rules of the school (even though it is run by an extremely perverted principal).

Family
Not much is known about her mother and father, other than the fact that Yui lives with her parents and her brother. Her mom has a seemingly perky attitude, always wanting her to become more like a woman.

Appearance
Despite her disgust with anything inappropriate or rule-breaking, Yui is often complimented by Risa and Mio for having a very inappropriate and tempting body. She has a bust size comparable to Lala, and in general, a very similar figure to her. She has dark brown hair and lighter brown eyes. Her hair is usually worn down and she mostly wears her school uniform.

Personality
Yui has a very stern, no-nonsense personality. She has difficulty coping with Risa and Mio's jokes, and in general has difficulty coping with anything outside of her comfort zone. She's very shy about her body, and often yells at Yuuki Rito for being a perverted person, often when the situation isn't his fault. On that note, she has a fairly short temper.

Despite all this, she can also show her softer side, often towards Yuuki Rito, when she's not yelling at him, as shown when she makes him some chocolate for Valentine's Day (which she claims is obligatory). In general, she's become less serious due to the influence of Lala and Rito, and more accepting of the antics and trouble that often follow them. Even though Rito saw through her "underside" without her panties once, she did not over react on it, this gives a hint on her relationship toward Rito.

Rito Yuuki
Yui thinks of Rito as a pervert who will shamelessly have sex in public. However her distaste for him is slowly tempered as she slowly develops feelings for him. She comes to view him as kind and helpful while maintaining her opinion of him as a shameless womanizer.

Throughout the story she fights with her feelings about Rito trying to reconcile herself with the fact that she loves him. In a moment of weakness she even offers herself to him if he would remain faithful to just her, even trying to kiss him. She later says that she was just playing with him, but in fact, her true persona was the opposite, going as far as to do perverted acts with him.