In 'A Christmas Story', Schwartz is a buddy of Ralphie. He's part of the group of boys that experience the joys and challenges of growing up during the Christmas holidays. For example, they might be involved in schoolyard shenanigans or dealing with the expectations of Christmas presents.
Schwartz in a Christmas story could potentially be a unique individual with his own story arc. He might be someone who has a special connection to the Christmas magic in the story. For example, he could be the one who discovers an old Christmas tradition that has been forgotten and brings it back to life. Or perhaps he is a character who has a change of heart during the Christmas season, learning the true meaning of giving and kindness through the events of the story.
Schwartz is one of the characters in A Christmas Story. He's a friend of the main character. They get into various adventures and experiences together during the Christmas time depicted in the story.
I'm not sure exactly who Michelle Brown is without reading the story in detail. But she is likely the victim of identity theft in this particular account.