She is a very kind, caring, and thoughtful person, because even though Tōru often teases and scares her, she is still kind to her, such as when she insists they celebrate for her birthday even though Tōru says she doesn't need a celebration.

“Constantly scared of things”

Run is surprisingly a obtuse and extremely clumsy girl to the point where her friends often have to stop her from either hurting and/or humiliating herself in the process. This is mostly due to her being a bit ditzy, and is also very carefree, and does whatever she feels like at the moment, such as following ants to their ant hill, and so on. She's also been occasionally known to be emotionally sensitive