Nekobaa

is an old woman who lives in an abandoned city together with her granddaughter, Tamaki. She runs a supplies shop that the Uchiha clan used to use. She lives with lots of cats, including talking ones such as Denka and Hina.

Background
In the anime, Itachi Uchiha would usually visit Nekobaa for errands he had to run with a young Sasuke Uchiha tagging along with him every time. Sasuke would get bored and throw tantrums so Itachi made a game to collect paw prints from fast and nimble cats, the Paw Encyclopedia which Nekobaa continued after Sasuke stopped collecting paw prints. Nekobaa collected one of the two last paw prints Itachi assigned, that of the Two-Tailed Monster Cat which the jinchūriki Yugito Nii agreed to give after being asked by Nekobaa.

Itachi Pursuit Arc
Sasuke came to her to buy some items for his new team, Hebi. She told Sasuke that she remembered how Itachi and he were once "little kittens", and said that she couldn't believe they now wanted to kill each other.

Konoha History Arc
In the anime it was shown that before the timeskip Team Kakashi received a mission to capture and retrieve the paw print of a certain cat for Nekobaa's encyclopedia. Upon hearing this, Sasuke took this on as a personal mission. It was later revealed that he and Itachi had been doing this for several years when they were younger. In the end when the paw print is retrieved Nekobaa reveals that this was a test set by Itachi as another hurdle for him to overcome.