Suruga Kanbaru

A girl who made a wish to a monkey. She first appeared in "Suruga Monkey." Main character in "Suruga Monkey," "Nadeko Snake," "Suruga Devil," "Koyomi Water," "Shinobu Mail," and "Suruga Bonehead." A junior one year below Koyomi and his friends, she is a star who elevated the weak basketball team of Naoetsu High School to national level. Known as the "Godspeed Angel" in the girls' basketball scene. Although not tall, she possesses exceptional athletic abilities and leg strength, capable of jumping over Koyomi, who is taller than her. She has had a senior-junior relationship with Hitagi since middle school, and initially repelled her with harsh words when she approached to recruit her, but later admired her for trying to protect her from her entourage, leading to their relationship being dubbed the "Valhalla Combo." Suruga herself coined this nickname. After Hitagi graduated, she called herself "Ganbaru Suruga-chan," but it did not catch on. Her maiden name is Gaen.

Suruga is extremely positive, often excessively praising Koyomi and Hitagi, and is diligent with a friendly and refreshing personality. She is popular among junior girls and has an unofficial fan club named "Kanbaru Suru," indicating her caring nature, but she is secretly a fujoshi who likes BL. Moreover, she is a lesbian, masochist, exhibitionist, and sexually frustrated, and she embraces these traits. She gives off more of a lewd than sporty impression, and Meme once called her "Erotic Kid."

She deeply loves Hitagi and takes pride in being special in that sense, disliking it when others deny this aspect of her. She was jealous of Koyomi dating Hitagi and stalked him for a while, making her well-versed in topics related to Koyomi and Hitagi's relationship. She is lax with herself, often lounging in her room in underwear or naked, and her room is so messy that she forgot the color of the tatami mats. Koyomi regularly cleaned her room twice a month from his first visit until he graduated from high school (he still visits to clean occasionally). However, she is strangely strict about certain things and has a self-punishing side, leading others to view her as serious. She grew her hair long after "Karen Bee," but returned to a short cut at the epilogue of "Suruga Devil" when Koyomi cut it for her. She is extremely weak in simple games of chance like rock-paper-scissors and card games.

Her parents died in a traffic accident when Suruga was in elementary school. She was then taken in by her paternal grandparents. When she entered high school, she noticed the problems Hitagi was facing and tried to help, but was rejected. After some time apart, Koyomi solved Hitagi's problem and started dating her, which made Suruga resent him. Her mother, Tooe, left behind the "Devil's Hand," and Suruga wished to return to her old relationship with her senior, but the devil tried to fulfill the underlying wish to eliminate Koyomi Araragi. However, thanks to the efforts of Koyomi and Hitagi, the wish was not granted, and her left arm remained as the devil's arm. Since then, she has returned to her previous relationship with Hitagi and has built a good relationship with Koyomi. She gave them a bouquet when they graduated. Meme predicted that the demonic power of the Devil's Hand would wear off by the time she turned 20, but it returned to normal in the spring of her third year of high school due to a certain incident.

Five years later, in "Musubimonogatari," she is aiming to become a sports doctor.

It is noted that all female relatives of Suruga, including herself, have names containing old provincial names corresponding to present-day Shizuoka Prefecture (Suruga, Izu-ko, Tooe) [citation needed].