One possible plot could be that Naruto is made fun of during a Christmas party in the Hidden Leaf Village. Maybe because he doesn't understand some of the Christmas traditions that the villagers have adopted from other cultures. For example, he might get confused about gift - giving and end up giving something really strange, and the other villagers make fun of his naivete.
Sasuke could be involved. He might be one of the ones making fun of Naruto, in his typical aloof way. Or he could be in the background, just observing and secretly finding it a bit funny while pretending not to care. Sakura could also be there. She might scold the others for making fun of Naruto, or she could join in the teasing a little bit out of her own insecurities.
A great Christmas activity with your wife could be decorating the Christmas tree together. You can choose your favorite ornaments and reminisce about where you got them or what they mean to you. It's a really sweet and bonding experience.
My cousins and I used to have a tradition of building a gingerbread house every Christmas. We would compete to see who could make the most creative design. It was always a lot of fun, with frosting and candies everywhere.
Well, in Christmas stories, there are many fun facts. For example, the concept of Santa Claus has roots in different cultures. In some European traditions, there was a figure similar to Santa who brought gifts. The story of Rudolph the Red - Nosed Reindeer was created as a marketing gimmick for a department store but has become an iconic part of Christmas. And mistletoe was considered a magical plant in ancient times, and that's why we have the tradition of kissing under it during Christmas.
Well, in the realm of fanfiction, anything is possible. There could be fanfictions where Naruto is made of chakra. This could be a way for the author to explore different aspects of the Naruto universe. Maybe it's a way to show a more spiritual or elemental side of Naruto. It could also lead to new plotlines like how he copes with being such an unusual being in a world where most people have chakra but aren't made of it.
A fun Christmas story might have a family doing something out of the ordinary. Such as a family who instead of having a traditional Christmas dinner, they have a picnic on the snow. They bring hot chocolate in thermoses and sandwiches. And they build snowmen right there next to their picnic spot. There could also be children finding a hidden Santa's workshop in the woods and helping the elves for a day.