The main characters are surely Sailor Moon and her Sailor Scout friends like Sailor Mercury, Sailor Mars, Sailor Jupiter, and Sailor Venus.
The main characters are Usagi Tsukino / Sailor Moon, Ami Mizuno / Sailor Mercury, Rei Hino / Sailor Mars, Makoto Kino / Sailor Jupiter, and Minako Aino / Sailor Venus. Also, Tuxedo Mask plays a crucial role.
The main characters are Usagi Tsukino (Sailor Moon) and Mamoru Chiba (Tuxedo Mask).
The main characters are the Sailor Scouts like Sailor Moon, Sailor Mercury, Sailor Mars, Sailor Jupiter, and Sailor Venus.
Most likely Sailor Moon herself will be one of the main characters. Alongside her, Sailor Mercury, Sailor Mars, Sailor Jupiter and Sailor Venus are likely to be important as they were in the original story.
The main characters are Sailor Moon and her fellow Sailor Guardians, like Sailor Mercury, Sailor Mars, Sailor Jupiter, and Sailor Venus.
The main characters are likely to be Sailor Moon and the other Sailor Guardians. They are the ones who usually fight against the Dark Kingdom.
Typically, Sailor Moon herself would be one of the main characters. In a fanfic like this, she might be at the center of the story, dealing with the events related to Andromeda Rising. Her friends, the other Sailor Scouts such as Sailor Mercury, Sailor Mars, etc., would also likely be main characters as they usually support Sailor Moon in any adventure. There could also be new characters introduced specifically for this fanfic that are related to the Andromeda Rising concept.
Obviously, Sailor Moon (Usagi Tsukino) is one of the main characters. She is always at the center of the action in Sailor Moon stories, and Christmas Stories would be no different. Mamoru Chiba would also be involved as he is an important part of Usagi's life.
Baby Sailor Moon herself is obviously a main character. Then there are usually her friends like Baby Mercury, Baby Mars, etc. The cat guardians, like Luna in her younger form if it's included, can also be main characters. Sometimes, there might be new characters created specifically for the fanfiction, like a baby fairy who helps the baby Sailor Guardians.
Some characters might laugh. If the fanfiction has humorous elements, like a comical take on their battles or relationships, they would find it entertaining. For instance, if there's a fanfiction where the Sailor Scouts accidentally swap powers and get into all sorts of wacky situations, the characters themselves might chuckle at the absurdity.