I'm not sure specifically which 'bunny pjs a christmas story' you are referring to. It could be a story about a bunny in pajamas during Christmas. Maybe it involves the bunny's adventures on Christmas Eve or Christmas day, like going to see the Christmas tree or getting presents.
Well, in 'A Christmas Story', the pjs could be a symbol of the coziness of Christmas at home. They are likely to be warm and comfortable, which is important during the cold Christmas season. They also might have some sort of pattern or design that is typical of the era the story is set in, perhaps something like plaid or stripes, which gives a nostalgic feel to the whole story.
One idea could be that the oc retains some memories of their past life. So they use their knowledge to change things in the pjs world. For example, they might know of a coming danger and work to prevent it.
Perhaps there is a dark force that is awakened by the oc's reincarnation. This force might have been dormant for a long time, and the oc's new life energy or something about their reincarnation stirs it. It could be a force that wants to destroy the balance of the pjs world, and the oc is the only one who can stop it because of their unique perspective from their past life.
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.