Stitch

Stitch, also known as Experiment 626, is a fictional character from Disney’s Lilo & Stitch franchise. A genetically engineered, extraterrestrial life-form resembling a blue koala, he is the more prominent of the franchise’s two title protagonists, the other being his human adopter and best friend Lilo Pelekai.

https://en.wikipedia.org/wiki/Stitch_(Lilo_%26_Stitch)