Who are the main characters in the 'Castration Day Story'?

I'm not sure specifically which 'Castration Day Story' you are referring to. It could be a fictional story about a day related to castration in a very strange or specific fictional context, or perhaps it's a story with a symbolic meaning where 'castration' represents something other than the literal act, like the loss of power or masculinity in a more metaphorical sense.

I don't know the 'day 9 story', so I can't tell who the main characters are.

In 'Game of Thrones', Theon Greyjoy is a key character in a castration story. Ramsay Bolton castrated him, which was a very cruel act. It changed Theon completely, turning him from a somewhat cocky young man into a broken shell. Also, Varys was castrated when he was young. His castration led him to be more secretive and manipulative as he had to find other ways to gain power and influence in a world that often shunned eunuchs.

There could be various main characters. If it's a corporate training day story, the main characters might be the employees who are being trained, the trainer who is leading the session, and perhaps a manager who is observing the training. In a sports training day story, it would likely be the athletes and their coaches.

The main character is Phil Connors. He's a Pittsburgh TV weatherman who travels to Punxsutawney for the Groundhog Day event. Alongside him, Rita Hanson is a significant character. She's Phil's producer and love interest. There are also various townspeople in Punxsutawney who are part of Phil's repeated day experiences, such as Ned Ryerson, an old acquaintance of Phil's who he keeps running into during the time loop.

Since I don't know the story, I can't say for sure. It could be a young boy who loves to fly his model plane on windy days.

It depends on the specific 'yes day story'. It could be a family with parents and children as the main characters. For instance, in a common family - based 'yes day story', the mom, dad, and their two kids are the central figures. They are the ones experiencing all the yes - day adventures.

There could be a young adventurer as the main character, eager to explore the world in just one day.

Since I don't know the details of the 'girl for a day story', it's hard to say who the main characters are. But surely the girl herself is a main character. There might also be her family members, friends, or people she meets during that day.

Since I don't know the specific'selection day story', I can't say for sure who the main characters are. They could be ordinary people, like a young man or woman trying to get selected for something.