Yūki Rito/Plot

Plot
In the beginning, he lives alone with his sister due to their parents always away to work. Rito is quite shy when it comes to girls. He has a crush on a girl named Haruna Sairenji, whom 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 is on the run from home because of her father forcing her into arranged marriage. It's stated in the anime that due to accidently groping 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 truly love him and desire to marry him for real and came to live at his home.

Since Lala's arrival, Rito goes through a lot of trouble that comes from space, such as her other fiancé candidates and many others. Although thanks to Lala, he has also befriended many characters, including Haruna, who, unaware to him, also has feelings for him.

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. By the end of To Love-Ru, as pointed out by Saruyama, Rito has changed a lot around women since Lala came into his life. It was at this point that he realized 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 would no longer apply, making polygamy legal 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, although Rito is happy he told Lala about his feeling, his is depressed at his recent failure in confesing to Haruna, instead accidently doing so to four other girls, whom he tried to convince that he said "I love the pool", although he's not sure if they believed it. Rito might be reconsidering about Lala's idea of being with both her and Haruna, thinking it be treating her as insurance, however Momo comes in naked (while he is 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.

Currently, Rito has not yet confessed his love to Haruna, but instead decides to take his time to sort out the feelings he has for both Haruna and Lala.