The short answer to best describe Pooka was small and cute. She is a small squirrel with her fur mostly light brown in certain spots and wore blue shoes, a blue scarf, and adorns a yellow flower on her head.
In contrast to the quiet Salum, Pooka has a cheerful and energetic personality. Sometimes she scolds the less responsive Salum, and sometimes she goes on behalf of him. She respects Puck, who is famous as one of the four spirits, and is so angry that his feelings are disrespectful to Subaru, who treats Puck as usual. She also claims herself to be Puck's "admirer".
Pooka's boss design was an inspiration to Hamsuke from the Overlord series.
It's speculated that Pooka was created by Mother. The reason being is that there's a moment that Tiga mentioned that Mother ordered Pooka to keep an eye on Salum.