Perhaps a water sprite. Water sprites are known for their connection to water, and as a puddle paddler, it would be natural for it to be the main character. It could use the puddles to travel around the human world, causing little mischiefs and also making friends with some kind - hearted humans.
A little girl with a special paddle could be the main character. She might be the only one in her village who can interact with the puddles in a magical way.
Well, it could be about a small creature, like a fairy, who uses puddles as portals to different magical worlds. Every time it paddles in a puddle, it's transported to a new and exciting place full of strange plants and friendly talking animals.
An ancient and malevolent spirit that was once trapped in the black puddle but has now been freed could be a major antagonist. This spirit wants to take over the queen's body and use her connection to the puddle to spread chaos across all the realms. It constantly whispers dark thoughts into the queen's mind, trying to make her lose control and become a puppet for its own evil plans.
I don't know as we haven't been given any details about the story. It could have characters like children who love to play in the mud puddle.
Perhaps an older, more experienced nurse like Martha. She has seen a lot in her career and is a bit jaded. But then she gets pulled into a fantasy adventure where she has to use her years of medical knowledge in unexpected ways. For example, she might have to treat a dragon with a broken wing using only the resources she has in her old - fashioned nurse's bag. And she becomes a hero in this new world.
The main character could be a young gardener who has a deep love for chrysanthemums. They discover the fantasy aspect when their favorite chrysanthemum starts to glow and leads them into a new world.
A brave knight could be the main character. He is known for his courage and chivalry. He discovers the noose during a quest to rescue a princess from an evil dragon. The noose might have some special property that can help him in his fight against the dragon or in navigating the dangerous dungeon where the princess is held.
It could be an ordinary boy who discovers he has extraordinary powers. Maybe he lives in a small village and one day, while exploring an old cave, he finds a magical amulet. This amulet gives him the power to control the elements. At first, he is scared of his new powers, but as he realizes the potential to do good, he decides to use them to fight against an approaching army of demons. He has to learn how to master his powers quickly and also convince the people in his village to trust him.
I have no idea who created 'crimson puddle fanfic'. It could be anyone from a passionate fan within a certain community to an amateur writer who just had an interesting idea about a crimson puddle.
A tomboyish tall girl could be the main character. She loves climbing trees and exploring the outdoors. In her fantasy story, she discovers a hidden world up in the tall trees that only she can reach easily because of her height. She befriends the magical creatures there and has adventures, teaching others that being different, in this case tall, can lead to extraordinary experiences.
It could be a little girl who finds a magic green stone that transports her to a world full of green - hued wonders. In this world, she has to learn how to use the power of the color green to find her way back home while also helping the local inhabitants.