Reina 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 takes care of Keiichi whenever possible, but is also na\xefve and is usually subject to light teasing by Keiichi, it is hinted later in the series that she loves him. 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"), which are usually moekko characters or items she finds while scouring the local dump. Generally, these things are not considered cute by others. She also utters the phrase haū (はぅ) when excited or flustered, and has a habit of repeating phrases at the ends of her sentences, most famously kana? kana? (かな? かな??, lit. "I wonder, I wonder?").
According to Mion, while Reina might seem cute herself, people should be careful not to anger her as she becomes quite scary when angered.