Well, the themes of redemption and new beginnings can be found in some 'draco and baby teddy fanfiction'. Draco, who has had a somewhat troubled past in the original 'Harry Potter' series, can find a form of redemption through his relationship with the innocent baby teddy. It gives him a chance to start anew, to be a better version of himself. And for baby teddy, it's a new beginning in terms of having a strong bond with someone like Draco. There can also be a theme of magic exploration, where they use magic together in unique ways.
One challenge could be the Time - Turner rules. If they are using a Time - Turner, they need to be very careful not to break any of the laws regarding time travel. For example, they can't be seen by their past selves or make significant changes that would disrupt the future they come from. Another challenge is the danger of the time period they visit. If they go to a time when Voldemort was active, they are at great risk of being detected by Death Eaters.
There are also other characters like Matt Donovan who, despite being human, has a good heart and knowledge of the town. He could potentially be an ally in a different way, like providing information about the town's non - supernatural aspects. And then there's Alaric Saltzman, who has dealt with all kinds of strange things. His experience and wisdom could be valuable to Harry and Teddy.
In fanfiction, Harry might be protective of Teddy because Teddy is Remus and Tonks' son. Harry has a strong sense of loyalty and he may feel a great responsibility towards Teddy as he lost his parents. Also, Harry has his own experience of growing up without parents, so he doesn't want Teddy to go through any hardships alone.
Luna Lovegood would be a great addition. Her unique perspective on magic could offer new insights to Teddy. Also, Ron could be included as Harry's best friend. His humorous and sometimes clumsy nature could add some light - hearted moments to the story.
One possible reason could be to protect Teddy. Maybe there are some threats in England that Harry wants to keep Teddy away from. For example, there could be some dark wizards or dangerous magical creatures that target Teddy for some reason.
Hermione and Ron would probably be there. They are Harry's best friends, so they might be like aunt and uncle to Teddy. They could help Harry out with raising Teddy, like Hermione giving educational advice.
Another plot could be that Teddy and Victoire have their baby during a time of unrest in the wizarding world. They then have to protect their baby from the chaos and danger. This could involve hiding their family, teaching the baby self - defense magic at an early age, and relying on their own skills and the loyalty of their friends to keep the baby safe.
One great 'ginny and baby teddy fanfiction' story could be about their adventures in a magical forest. They might discover new magical creatures together. Another could focus on how Ginny helps Baby Teddy learn some important spells. There are also ones where they get into some light - hearted mischief in Hogwarts.