So apparently in that Japanese Stitch! anime, Lilo is not, in fact, retconned out of existance. The series actually serves as a sequel to the movie: after the events of Lilo & Stitch (and the subsequent spinoff show/movies), Lilo grew up and left for college. She promised that she would come back to visit Stitch on a scheduled day. However, Nani ended up becoming pregnant and Lilo had to take care of her, forcing her to miss her meeting with Stitch. He spent the entire day waiting for Lilo, and when she never arrived he assumed that she had outgrown him. Heartbroken, he left Hawaii and went back into space. Sometime later he once again crashed on a tropical island, except in Japan. He met Yuna, a young girl there who reminded him of Lilo, and the two became good friends. Three years after that, Lilo finally managed to track down Stitch and left for Japan with her young niece But when Lilo saw that he had found a new little girl to be friends with, she decided to keep her distance from him and let go of the past. Unbeknownst to Lilo, Nani’s daughter escaped from daycare and spent the day with Stitch, eventually revealing that her Aunt Lilo was with her. Lilo took the girl and quickly left. Stitch felt rejected and confused, but Yuna convinced him to chase after her and reconcile their friendship. Lilo explained that she was afraid that if Stitch saw her, he would want to leave his new friend. She told him that she’s grown up and that he should show Yuna all the joy and adventure growing up that Lilo did. Lilo and Stitch finally made peace with each other again and hugged, still united as an Ohana.
This isn’t even fan fiction, guys. This is freaking canon.
the only thing that bothers me is that Stitch was banished specifically to Hawaii, specifically with Lilo as his handler. This must have been bureaucratic hell in space.
You forgot the most badass part: He fights youkai in Japan.