In the world of the "Atonement Arc", one of our heroines, Rena Ryugu, is portrayed as the main character. The girl Rena is the character who truly embodies the world of Higurashi with its intense ups and downs, and I don't think anyone could represent Higurashi as well as she does.
The girl Rena really does have a lot on her mind. After thinking seriously about so many things, she deliberately creates a persona that doesn't seem to be thinking anything at all. It's precisely because she is that way that she is able to consider the possibility that other people, like her, have created their own outward personas after thinking seriously and agonizing over things. In that sense, I hope that you will understand how uch it hurts her when, in the story, Keiichi irresponsibly envies Rena for being so carefree every day.
I think htat it's because Rena represents Higurashi that she is the one featured most often in Higurashi illustrations. And when she is, she can never be without her trademark item, the nata cleaver. If you pay careful attention while reading the original, it's true that she does have the cleaver in a lot of shocking scene. But if you look at it more generally, it doesn't actually show up very much. She has it in all of the illustrations, so I suspect people might get the impression that she walks around with it every day.
Inicdentally, the cleaver is a dangerous weapon. Dangerous weapon is kyouki, which leads us to a different kyouki, madness - the madness of an ordinary girl. So Rena's always holding the cleaver hints at the madness hidden in daily life. ...In that case, if she loses that madness, will all the world's problems be resolved...? Rena is on the box of the last arc of the original series, the "Festival Accompanying Arc", but here is nothing in her hands; her weapon is gone.
...The weapon kyouki leads to the madness kyouki.
...Do you have any kyouki in your pockets...?