Kokoro Kosaka

About

A 16-year-old high school student, Kokoro deeply admired Warabi while he was still alive. She made the stuffed wallaby (Warabi's current body) as a tribute during his funeral. She is somewhat violent and her thinking is simplistic, characteristics shared by her niece Emi.

Kokoro makes a cameo appearance in Azumanga Daioh (both manga and anime). During the first year, she attends the school culture festival with Warabi in her pocket and is perplexed by the unrecognizable stuffed animals made by Osaka and Sakaki.

(Source: Wallaby Wikia)