The Time Child in Doctor Who fanfiction can introduce new plotlines and character developments. It might also play a role in exploring alternate timelines or universes, giving writers more creative freedom.
Some stories focus on the Doctor's encounters with friendly aliens and have lessons about friendship and bravery. They're designed to capture a child's imagination and keep them engaged.
Such fanfiction could feature unique plot twists and unexpected developments in the relationship between The Rani and the child. It might also incorporate elements from the original Doctor Who universe in creative ways.
Hard to say exactly without reading it, but it could be that the Unerathyl Child has some special ability or connection to a greater threat. The Doctor might have to protect the child and the universe from whatever danger it brings. Maybe there are timey-wimey elements involved too!
In a 9th Doctor and child companion fanfiction, the adventures they embark on would be quite different from his usual ones with adult companions. The child might be more inquisitive about the simple things that the Doctor takes for granted, like how the TARDIS works. This could force the Doctor to explain things in a more basic and understandable way, which in turn could make him see his own world in a new light. And of course, the danger they face would be even more intense as the Doctor would feel an extra sense of protectiveness towards the child.
Well, sometimes watching Doctor Who can inspire fans to create fanfictions like 'Unearthly Child'. It might explore what happened before or after the events in the show, or offer alternative storylines. It's a way for fans to express their creativity and love for the series.