Stitch (also known as Experiment 626) is one of the two titular main protagonists (alongside Lilo Pelekai) of the Lilo & Stitch franchise. He's an alien experiment created by Dr. Jumba Jookiba. Originally created to cause chaos across the galaxy, he is marked by his short temper and mischievous behavior, traits that endear him to his friend Lilo, who adopted him as her "dog" and taught him to love and care.
In the original film, he was introduced as a vicious monster, but thanks to Lilo, he reforms to become a kind-hearted, empathetic being.
In the English versions, he is voiced by his creator and the film's co-director and co-writer Chris Sanders.
