Yūki Rito/Plot

Plot
Rito is the main male protagonist of both manga and all three anime series. In the begining he lives alone with his sister due to thier parents alway away on work. Rito is quite shy especialy when it comes to girls, he has a crush on a girl named Haruna Sairenji which he constantly tries to confess to but always backfires on him (a running gag in the series). One day, after another failed attempt to do so, he encounters an   (naked)  alien princess named  Lala  while in his bathtub who was on the run from home because of her father forcing her in arranged marriage, it's stated in the anime that due to accidently grouping her breasts he is now engaged to her. At first, she only pretends to show affectionate feelings for Rito at the beginning of the story so that she can stay on Earth but came to truely love him and desired to marry him for real and came to live at his home.

Since Lala's arrival, Rito goes throw a lot of trouble that comes from space, such as her former fiance candidates and many others. Although thanks to Lala, he has also befriended many characters including Haruna who unaware to him aslo has feelings for him. Rito's nature is borderline clumsy, where he always ends up molesting or groping the many girls in the series (unintentionally, of course). He is generally kind, thoughtful and has a lot of respect for women, though mostly by intention, and not so much by success. Due to his shyness around girls, he is very clumsy around women and has great difficulty maintaining his composure around any sort of stimulating situation. Even without interference from Lala's inventions, Oshizu's psychic powers, or Celine jumping into his face, Rito is on his own clumsy enough to trip over absolutely nothing, and possesses an extraordinary skill in accidentally reaching his hands or face into the breasts or other private parts of any girl within reach when he is falling. He is constantly hated by women because of this, although unknown to him, his kindness is what wins him the affections of most of the female characters in the series

Despite his enduring feelings for Haruna, Rito shows signs of developing deeper affection towards Lala. As the story progresses, he starts to show affections for Lala, but is unsure if what he feels is actually love. This is shown again when he couldn't help but think about Lala, even though he was naked with Haruna. As pointed out by Saruyama, that he has changed a lot around women since Lala came into his life, it was at this point that he realised he is in love with Lala, but he is also in love with Haruna.

In the end of the original series, he confesses to Lala, but tells her he also loves Haruna, yet she is happy on both parts (knowing that Haruna also loves him). He is confused as polygamy is illegal in Japan, but Lala replied that onced he and her are married, he will be the next king of Deviluke, meaning the laws of Earth no longer applies making polygamy legual for him. Lala then forces him to go tell Haruna (strapping a jet pack to his back). Right before Rito was about to tell her, she moves out of the way (due to her swimsuit being undone by Oshizu's ability) and just like whenever he confesses to her, it backfires on him, leading him to state "I love you" to Yui, Run, Nana and Mikado.

In To Love-Ru Darkness, altough Rito is happy he told Lala about his feeling, his is depressed at his recent failure in confesing to Haruna, insted accidently doing so to four other girls which he tried to convince them that he said "I love the pool" although he's not sure if they belived it. Rito might be reconsidering about Lala's idea of being with both her and Haruna, thinking it be treating her as insurerance, however Momo comes in naked (while he was bathing )  saying otherwise and that there are lots of girls who are secretly in love with him and initiates to build a harem  for Rito.