James is often shown as a brave and sometimes a bit reckless, just like his father. He's full of energy and always ready for an adventure. Teddy, on the other hand, is more mature. He has a kind heart but also a sense of responsibility, having grown up without his parents.
James might be really excited. He's heard stories about his father's friends, and Teddy is like a link to that past. He'd probably be full of questions about the Marauders and what his dad was like as a student. Lily, on the other hand, would be more reserved but still interested. She might be a bit more empathetic towards Teddy, considering his difficult past. Overall, they'd both be curious and eager to learn more from him.
There might be a fanfiction where they go on a journey outside of Hogwarts. They encounter magical creatures and face challenges that test their friendship. For example, they might have to deal with a group of dark wizards who are after a powerful magical artifact.
One possibility could be that Teddy is visiting Hogwarts for some event, perhaps a special anniversary celebration. James and Lily, being students at Hogwarts, cross paths with Teddy. Teddy, being the son of Remus Lupin and having a connection to their family through Harry Potter (James and Lily's son), might share some interesting stories about their parents' time at Hogwarts. Maybe he tells them about the Marauders and how their father and his friends were quite the mischief - makers. It could be a heartwarming encounter where James and Lily get to see a different side of their family's history through Teddy.
The unexpected movement can be really scary. For example, if a teddy bear that is supposed to be just a stuffed toy suddenly starts to move on its own, like crawling across the floor or sitting up when no one is touching it. That goes against what we know about teddy bears, which are usually associated with comfort and safety.
In many 'Hermione Adopted Teddy' fanfictions, Teddy's character often starts as a bit of a lost soul. Since he lost his parents at a young age, he can be shy and reserved. As Hermione takes him in, he begins to open up. For example, in some stories, he discovers a love for learning, especially in areas like Transfiguration, inspired by Hermione. His confidence grows as he realizes he has a stable home and someone who truly cares for him.
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.