Birthday: March 6

Height: 160 cm

Weight: 50 kg

3-sizes: 79-56-82 cm

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. She lives with her older sister Akiho Sairenji in an apartment and 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 him wildly, in an attempt to get rid of whatever frightens her. 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 lives with her older sister in an apartment.

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.