When Kei was first introduced, she was portrayed as a lonely, depressed and misunderstood girl. She had a hard time trusting anyone. But after meeting Naruto and becoming friends with the Konoha 11, she is shown to be a reserved girl with little emotions, which she only expresses when around Naruto. She is often seen stalking and hiding in different locations, which is often played on for comedic purposes (Like in bushes, behind trees, and even under tables). In addition, she gets into comedic arguments with Ino Yamanaka quite often, and they are often seen butting heads or having childish fist fights.