Not usually. In the classic Christmas story, Santa Claus or Jesus (in religious Christmas stories) are often the main characters. However, dad can be an important supporting character.
Jesus is often considered the main character in the Christmas story. Christmas commemorates His birth. According to the Bible, His birth was a miraculous event. Mary, His mother, also plays a very important role. An angel visited her and told her she would give birth to the Son of God. Joseph, Mary's husband, is also part of the story as he took care of Mary and Jesus.
Once upon a Christmas, there was a little girl named Lily. She was the main character in this story. Lily lived in a small village. On Christmas Eve, she noticed that the local orphanage didn't have enough presents for the children. So, she decided to use her own savings to buy small gifts for them. She went from store to store, carefully choosing items. When she finally brought the presents to the orphanage on Christmas morning, the smiles on the children's faces were priceless. It was a simple act of kindness that made that Christmas truly special.
In the classic 'A Christmas Carol', the main character is Ebenezer Scrooge. He is a miserly old man who is visited by three spirits on Christmas Eve and through their influence, he transforms into a more kind and generous person.
Since I don't know the details of the 'mikasa christmas story', I can't say for sure who the main character is. But if Mikasa is a name of a person in the story, then Mikasa would likely be the main character.
Definitely not. 'A Christmas Story' is centered around the story of Ralphie and his quest for a Red Ryder BB gun. The main characters are those in Ralphie's family and the people in his small - town world. Parker Stevenson doesn't fit into the main narrative of this classic Christmas movie. There's no indication that he has a major role in it at all.