Since I don't know the exact story, I can't say for sure who the main characters are. It could be a family with a mom, dad, and kids. Maybe there's a Santa Claus character if it's a more traditional Christmas - themed story.
The phrase 'you're gonna get it' in a Christmas story could have multiple interpretations. It might be related to a character finally getting to experience a long - awaited Christmas tradition. For example, a family has been saving up for a big Christmas dinner and one of the kids is told 'you're gonna get it' when it's time to sit down and enjoy the meal. It could also be about getting a chance to meet Santa Claus or receiving a long - desired Christmas present that has been promised. Another possibility is that it's a story about someone who has learned a valuable lesson during the Christmas time and is 'gonna get' the rewards of that new - found wisdom, like a more meaningful celebration.
It could mean that someone is about to engage in something really intense or wild in the style of a medieval or pulp fiction story. Maybe they're going to start a rough - and - tumble adventure.
I'm not entirely sure what this specific phrase means exactly as it seems rather odd and not a common expression. 'Gangrene' is a serious medical condition where body tissue dies. Maybe in the context of 'a Christmas story' it could be some sort of dark or strange threat or prediction within that story, but without more context it's hard to say for sure.
No way. In most cultures, Christmas is associated with positive things like family, giving, and celebration. Gangrene is a completely different concept that is related to illness and decay. There's no cultural context where this phrase would be a common or normal way of expressing something.