Lilo & Stitch is one of the most odd yet charming films in the Disney canon. Its mix of sci-fi and Hawaiian imagery also makes it one of the most visually unique of Disney's animated films, and most would agree Lilo is one of the cutest Disney protagonists. The 2002 film follows many threads - mysterious experiments, family tragedy, and even government conspiracies give the seemingly light-hearted comedy a bit more depth than one would expect from an animated children's film.
The movie has inspired numerous fan theories aiming to fill in gaps in the story's lore, and they cover everything from Lilo's parents to Pudge the fish. They question whether or not Stitch is really a good guy or if the accident that claimed Lilo's parents' lives was really an accident at all. One thing is for sure - the Lilo & Stitch ohana has formulated some truly remarkable theories that arguably make the movie even better than it already is.
At the end of the movie, Bubbles admits to working with aliens in the past. He even claims to have convinced the alien council that mosquitoes are an endangered species, thereby protecting Earth. Redditor /u/res30stupid believes this incident occured because the council attempted to eliminate Earth once before, likely in order to take out another dangerous villain.
Bubbles managed to convince them to spare the planet by capturing and returning the individual himself and concocting a cover story about mosquitos.
Redditor /u/yay855 proposes a theory about Lilo's future and possible career. Based on the Lilo & Stitch television series, Lilo clearly has a knack for matching alien experiments with work that utilizes their otherwise destructive talents.
She can use these skills to help people - and aliens - find the jobs best suited for them.
Bubbles is a social worker who checks up on Nani and Lilo periodically, but Redditor /u/AtleeH doesn't believe he's an ordinary social worker. One of the alien leaders recognizes him at the end of the film, and he is revealed to have been involved in some past alien shenanigans.
The theory suggests that Bubbles is a CIA operative, one who used to work with Nani and Lilo's parents before their tragic accident. Bubbles checks in on the girls as a favor to his former coworkers rather than as an actual social worker.
Redditor /u/kapu_koa proposes a solution to the question of who Nani and Lilo's parents were, and the answer connects back to Bubbles, the supposed social worker who regularly checks in on the girls. We know Bubbles was involved in an incident at Roswell, and the aliens recognize him at the film's close. He was likely some kind of government operative, such as an agent for the CIA.
Such a high-ranking figure wouldn't quit his job to become a social worker unless he knew the children he would be visiting. The theory suggests that either one or both of the girls' parents were CIA operatives, and that Lilo's obsession with photography may have been rooted in her parents' careers.
Perhaps she accompanied them on one of their secret missions and watched as they photographed various people as part of their operation. Now she takes pictures as a means of remembering her time with her parents.