Arai Sayaka

Arai Sayaka, named Matsuo in the first season of To LOVE-Ru anime, is a minor character, the classmate of Yūki Rito in both his first and second year. She is often seen hanging around with Shirayuri Koyomi. She and Koyomi are Sairenji Haruna's fellow members of the tennis club. It is strongly implied that Koyomi is in love with Sayaka.

In a special one-shot manga titled "Rito and Sayaka's After School" (リトと紗弥香の放課後, Rito to Sayaka no Hōkago) published in Shōnen Jump's April 27, 2019 issue, Sayaka plays a major role for the first time.

Appearance
Sayaka has short brown hair and black eyes in the manga (green hair in the first season anime, and black hair in To Love-Ru: Darkness and a few scenes of Motto To Love-Ru). Her measurements are B75-W55-H80. She has huge breasts in the manga but seem smaller in the anime.

Personality
Sayaka shows more of her personality in the "After School" one-shot, as a very straight forward girl who asks Rito which girl he likes the most. Sayaka always wants to protect Koyomi, especially from Rito's falling skill.

She is a bit of a tomboy and always speak in casual/impolite Japanese form, which can be considered not lady-like in Japan.

Plot
Sayaka never involved in any major plot throughout the original manga and Darkness, but she's featured as one of the most outstanding minor characters in Sainan High. Most of her appearances are for fanservice sake.

Shirayuri Koyomi
Sayaka is often seen hanging with Koyomi. They're both a member of the Sainan High tennis club. One time they were affected by Lala's special Valentine's chocolates, they were clinging on each other as if they're a couple but there's no real evidence that they're actually in love.

Yūki Rito
Sayaka believes that Rito is a dangerous guy who does indecent things to many girls. This changed a little after their incident in the "After School" one-shot.

Trivia

 * Sayaka resembles Ai from . Some readers mistaken her as Ai making a cameo appearance in recent manga chapters. However, Sayaka appeared in the To LOVE-Ru series several years before Tawawa.