Rena is a girl who returned from Ibaraki to Hinamizawa one year ago, and is in same grade-level as Keiichi. She is closer to Keiichi than most of her friends and is often found praising and comforting him when needed. She has an obsession with things she perceives as cute—generally, these things are not considered cute by others. Every now and then, she goes treasure hunting in the town's trash heap, searching for "cute" things to collect, and upon finding something "cute", it's difficult to stop her. She has a habit of repeating words at the ends of sentences, most famously kana? kana? and when finding something cute, she says Hau! Omochikaerī!. When in "Take it Home" mode, she comically becomes stronger and faster.
Source from Wikipeida
goes treasure, a habit of repeating words, observant