One idea could be about Stitch learning new Hawaiian traditions with Lilo and her family. For example, they could be preparing for a big luau together, and Stitch has to master a particular dance or cooking technique.
A fanfic could focus on Stitch and Lilo's adventures exploring new parts of the island. They might discover a hidden cave filled with ancient Hawaiian artifacts and have to figure out how to protect it from some greedy treasure hunters.
There could be a fanfic where Stitch uses his unique abilities to help Lilo's community. Maybe there's a problem with the local crops, and Stitch's strength and ingenuity are used to build a new irrigation system or protect the fields from pests.
Well, perhaps there could be a fanfiction where the Grand Councilwoman from Lilo and Stitch discovers the Pokemon world. She decides to send Stitch there on a mission to study the Pokemon. Stitch then forms a team with some Pokemon like Charmander and Squirtle, and they have to face off against an evil organization that wants to use Pokemon for bad things. It would be a fun mix of the two universes.
There are fanfics that focus on the relationship between Lilo and Stitch in different scenarios. For example, a story where they get separated due to some intergalactic event and have to find their way back to each other. Stitch might meet some old 'cousins' of his during this time who either help or hinder his journey back to Lilo.
Friendship is a very common theme. The original characters often form deep bonds with Lilo and Stitch, just like how Lilo and Stitch are friends. For example, in many fanfics, the OC might help Stitch when he gets into trouble with Jumba or other aliens.
Friendship is a very common theme. Lilo and Stitch have a special bond, and fanfics often explore how they support each other through different situations. Another theme is family. Since Lilo has her own family situation and Stitch becomes part of that family, it's often written about. For example, how Stitch adjusts to family life and the family's reaction to him.
It is highly inappropriate. 'Lilo and Stitch' has a positive image and is loved by many for its innocent and heartwarming story. Fanfiction should be in line with the general spirit of the original work, and sexual content has no place in relation to this particular franchise.
It's quite interesting. The characters and storylines are engaging.
One idea could be that Stitch gets transported to another dimension where he meets characters from a different animated universe. They could team up to fight a common enemy that threatens both their worlds. Another plot could involve Lilo somehow getting superpowers and joining Stitch on an intergalactic adventure to save other planets. Maybe they encounter a race of beings who are trying to steal the unique bond between Lilo and Stitch to use for their own evil purposes.
One idea could be a crossover where Lilo and Stitch end up at Hogwarts. Stitch could get into all sorts of mischief with the Marauder's Map. Another could be that Harry Potter somehow ends up on Lilo's island and has to deal with the local magic there which is different from his own. And perhaps Dobby could meet Stitch and they form an unlikely friendship.
Perhaps the pregnancy is a result of some sort of alien experiment gone wrong. Lilo and Stitch then have to find a way to reverse it if they don't think they're ready for a baby. But as time goes on, they start to warm up to the idea and decide to keep the baby, facing all the difficulties and joys that come with it.
The character development that can occur in a crossover is great. Lilo might learn new things about herself and her relationship with Stitch when they are in a completely new environment. For instance, if they cross over to a world full of magical creatures, Lilo could discover new ways to be brave and kind.