Sairenji Haruna

Haruna Sairenji is the second female protagonist of To Love Ru and one of Rito's classmates and the girl of his affections. Haruna has similar feelings for him, having been attracted to his kind, gentle nature since junior high. Despite her growing love for Rito, which she believes to be unrequited, she usually suppresses her feelings and cannot confess to him because of her friendship with Lala who also loves Rito. However, with some encouragement, she tells Lala of her ordeal, to which Lala accepts, claiming Haruna as her rival for Rito's heart, while remaining friends. There is also a running gag to where Rito is about to confess to her, only for something (or someone) to come between it.

She has a severe fear of ghosts and the supernatural, the exception being Oshizu Murasame but only to an extent. When frightened, she has a habit of grabbing the nearest thing around her – typically Rito – and swinging wildly, in an attempt to get rid of whatever frightens her.

A highly responsible person, Haruna's personality can sway her classmates' hearts to vote for her as their class representative, even when she did not run to be a candidate. She is affiliated with the tennis club and a southpaw. According to Mio Sawada, Haruna's measurements are B79, W56, H82.

She lives with her older sister Akiho Sairenji in an apartment.

Rito Yuuki
Haruna is a very kind, patient and understanding girl. More than most other girls in the series, Haruna has always known about and loved Rito's positive traits, despite also being a frequent victim of Rito's perverted clumsiness. She has realized and remembered that he must be a kind person since she noticed him taking care of the flowers at school when they are neglected by others.

Unknown to Haruna, Rito has harbored affections for her since before the start of the series, but because of his shyness and clumsiness, his numerous attempts to confess his love to her ended in failure. And unknown to Rito, Haruna has held affections for him as well. But she is hesitant to begin a romantic relationship with him due to her friendship with Lala, who is already pursuing a relationship with Rito.

Lala Satalin Deviluke
Haruna and Lala are best friends. It is because of her friendship with Lala that Haruna has been hesitant to pursue a romantic relationship with Rito. Lala, on the other hand, knows about Rito's feelings for Haruna, and is very enthusiastic to see them get together, believing that both girls can marry Rito together, as Earth customs would no longer apply to Rito when he marries Lala and becomes King of Deviluke.

As of To love-Ru Darkness, she has learned that both she and Lala can marry Rito together, which greatly surprised her, realizing the reason for Lala's cheerfulness about Haruna's feelings for Rito. She doesn't quite know what to make of the newfound possibility.

Oshizu Murasame
Despite Haruna's huge fear of ghosts, she has become very comfortable around Oshizu, and the two have become good friends, and are often seen together. Oshizu is the first to learn of Haruna's crush on Rito after briefly possessing her, and becomes very supportive towards Haruna confessing her feelings to him.

Risa Momioka and Mio Sawada
Risa and Mio are Haruna's close friends, and are often seen together in school. Haruna is less than amused by them constantly groping her.