Rena is the main female protagonist of the question arcs and a girl who returned from Ibaraki to Hinamizawa one year ago, she is in the same grade level as Keiichi. She is very kind and capable and takes care of Keiichi and her friends whenever possible, but is also naïve and is usually subject to light teasing by Keiichi, whom she has a crush on. She is distinguished by her obsession with things she perceives as adorable, calling them kāii (かぁいい), a slurred form of kawaii (かわいい) meaning "cute." Those tend to be moekko characters or items she finds while scouring the local dump, which are not considered cute by others. Despite this disarming trait, Rena is shown to be amazingly observant and perceptive about the things around her.
~!In Watanagashi-hen, she was able to deduce that both Rika and Satoko went to the Sonozaki house by looking through the contents of their fridge and a flier). When she needs a weapon, she uses a large cleaver that she found at the dump (in the anime) or a toolshed (in the manga and game). According to Mion, while Rena might seem cute herself, people should be careful not to anger her as she becomes quite scary when angered.!~
~!Rena's real name is Reina, a name she used normally before she moved from Hinamizawa to Ibaraki with her parents one year prior to the events of the story. There she discovered her mother having an affair, causing Reina to smash all the windows in her new school and assault three male students with a metal bat under the influence of the Hinamizawa syndrome. Believing herself to be cursed by Oyashiro for leaving Hinamizawa, Reina returned to the village with her father shortly after the incident and abandoned her real given name to "Rena" out of shame of her parents' subsequent divorce, holding herself responsible and hoping to begin life anew. So as not to alarm Keiichi, Rena claims to be a relative newcomer to Hinamizawa herself. Because of the incident, Rena is sensitive about the topic of Oyashiro, believing strongly in the existence of the deity and the curse, and becoming angry and unstable whenever anyone questions it. Rena is especially sensitive about the topic of Oyashiro; in Tsumihoroboshi-hen, her delusions about the god's true nature go so far as to make her take the school hostage, trying to unreasonably force a police investigation into the matter.!~
~!In Watanagashi-hen, she was able to deduce that both Rika and Satoko went to the Sonozaki house by looking through the contents of their fridge and a flier). When she needs a weapon, she uses a large cleaver that she found at the dump (in the anime) or a toolshed (in the manga and game). According to Mion, while Rena might seem cute herself, people should be careful not to anger her as she becomes quite scary when angered.!~
~!Rena's real name is Reina, a name she used normally before she moved from Hinamizawa to Ibaraki with her parents one year prior to the events of the story. There she discovered her mother having an affair, causing Reina to smash all the windows in her new school and assault three male students with a metal bat under the influence of the Hinamizawa syndrome. Believing herself to be cursed by Oyashiro for leaving Hinamizawa, Reina returned to the village with her father shortly after the incident and abandoned her real given name to "Rena" out of shame of her parents' subsequent divorce, holding herself responsible and hoping to begin life anew. So as not to alarm Keiichi, Rena claims to be a relative newcomer to Hinamizawa herself. Because of the incident, Rena is sensitive about the topic of Oyashiro, believing strongly in the existence of the deity and the curse, and becoming angry and unstable whenever anyone questions it. Rena is especially sensitive about the topic of Oyashiro; in Tsumihoroboshi-hen, her delusions about the god's true nature go so far as to make her take the school hostage, trying to unreasonably force a police investigation into the matter.!~