One possible scenario in this fanfiction could be that Syndrome, still bitter about his defeat by the Incredibles, targets Jack - Jack as a way to get revenge. He might see Jack - Jack's multiple powers as a valuable asset or a threat that needs to be neutralized. Syndrome could use his high - tech gadgets to abduct Jack - Jack while the family is distracted.
A motive could be power. Jack - Jack has a wide array of powers, and any villain or power - hungry character in the fanfiction might want to harness those powers for themselves. They could think that by kidnapping Jack - Jack, they can study his powers and replicate them or use him as a weapon.
They could be entertained. Characters like Frozone might find it really interesting to see how fans envision their world and relationships. He might even laugh at some of the more comical interpretations in the fanfic. Fanfics can often bring out new aspects of their personalities in a fun and unexpected way.
It contributes by giving fans more content. Fans are always hungry for more stories about their favorite characters, and the fanfic satisfies that need. It also allows for a wider range of voices in the fandom. Different writers can bring their own ideas and perspectives, which enriches the overall discussion and enjoyment within the Incredibles community.
Eyeless Jack can be developed by showing his softer side when interacting with the baby girl. For example, he might be more patient and gentle, which is a contrast to his usual menacing reputation. This can add depth to his character.
In this fanfiction, Marshmallow could be a significant character. He's a large and somewhat intimidating snow creature created by Elsa. But with the baby on the way, he could become a gentle protector. He could stand guard outside their home to keep any potential threats away. Also, the trolls from the Frozen universe could play a role. They are wise and could offer their knowledge on how to take care of a baby with magical powers. They might even perform a special ceremony for the unborn baby.
One interesting plotline could be the further exploration of the family's relationships. For example, how the kids deal with growing up with superpowers in a world that still has some prejudice against supers. Another could be the origin stories of the villains in more depth, like Syndrome. Maybe there could be a fanfic where he had a chance at redemption.
One common theme is family. It shows how Jack and Elsa form a family with their baby and all the love and care that comes with it. Another theme can be the combination of their powers in the baby. Their baby may have a unique blend of Jack's wintery powers and Elsa's ice powers.
Perhaps in this form, Jack Frost is befriended by a young human child. The child doesn't realize he's Jack Frost and just thinks he's a really cool and strange little animal. They go on adventures together in the winter wonderland, with Jack Frost using his powers in small, unnoticeable ways at first.