Nata Onna
Rena is quite a cutesy, though she herself seems to have a different idea of cute, as said by Mion. Rena's hobby is to go around the garbage and look for treasures, such as a 1/1 scale advertising figure which was thrown by someone, or an old crashed van she cleaned up and turned into a "secret base". Whenever she finds something she thinks is cute, she will first react by saying "omochikaerii", meaning "I want to take it home!" or even "I'd like a take-out!".
While saying that, she makes a noise which could be dubbed as "Hau~", adding to her cute side. She tends to end sentences with ~kana, kana, adding to her cute side. The kana is also considered reference, by some, to the noise that the cicadas make around the area.
She is quite a competitive person, probably developed after she met Mion and "the club", as she hates losing in the club games; not only encouraged by the penalty game, but she also seems to like making others do it. Although Rena is competitive, she has sportsmanship, and will gladly agree to finish a game which was concluded by a draw on a later date.
Rena is also quite a young detective, as seen from events in which she discovered criminals before the police.
According to Mion, while Rena might look cute, people should be careful not to anger her, as she becomes quite scary when angered.
It would seem that Rena values her friends a lot more than most people do, yet is still faithful to the village and will not forgive those who think of running away from it or betraying it.
Cleaver.