There's not enough information to say exactly who Davey is. He could be a fictional character created specifically for this story to experience and tell about the first Christmas.
Since we don't really know the full story, it could be that there is a wise old man or woman in the village (if it's set in a village) who tells Davey about the origin and significance of Christmas. Or perhaps there are other children in the neighborhood who Davey plays with during the Christmas season and they all learn about Christmas together. Another possibility is that there is a local shopkeeper who gives Davey a special gift or some advice related to Christmas.
The significance could be in its unique take on the first Christmas. Maybe it shows the story from Davey's perspective, which might give new insights into the traditional Christmas narrative.
The main idea might be about Davey's experience during the first Christmas. It could involve his discovery of the true meaning of Christmas, perhaps through interactions with family, friends or seeing the Christmas traditions for the first time.
Friendship is a very common theme. Their bond, whether it's a new friendship forming or an existing one growing stronger. Another theme could be mutual support, like how they help each other out in difficult situations.
I'm not familiar with a character named Bronwyn in Adventure Time. It could be a very minor character or a name that is not part of the mainstream Adventure Time canon.
Adventure Time is a fantasy adventure story set in the Land of Ooo. It follows the adventures of Finn the Human and his best friend Jake the Dog as they encounter various magical creatures and go on wild quests.
The story of Adventure Time is a fun and imaginative one. It follows Finn and Jake as they explore a post-apocalyptic world, make friends with unique characters, and face various challenges. There's a lot of humor, heart, and fantasy elements.