One idea could be that the boy and his dog go on an adventure to find a hidden treasure in the forest. They face various obstacles like wild animals and difficult terrains but their bond helps them through.
Perhaps the dog has a special ability, like being able to communicate with other animals. The boy and the dog use this ability to solve a mystery in their town, such as finding out who has been stealing from the local stores.
One plot idea could be the black sheep dog having extraordinary adventures in a magical forest. It discovers hidden paths and meets strange creatures. Another could be about the dog's relationship with its owner in a difficult situation, like during a natural disaster where they rely on each other for survival. Or perhaps a story where the black sheep dog is a misunderstood hero in a small town, constantly saving the day but not getting the credit it deserves.
Perhaps a fanfic where Beast Boy has to prove himself to a new group of heroes. He goes through a series of trials that really test his limits and his badass side comes out as he overcomes each one, showing his unique combat skills using his shapeshifting.
A possible plot could be that the reader has a special ability to communicate with spirits. Smile Dog is a spirit that has been cursed and is now trapped in a form that scares everyone. The reader tries to help Smile Dog break the curse and in the process, they face many challenges together, including other malevolent spirits that don't want the curse to be broken.
One plot idea could be Katz getting a taste of his own medicine. Maybe he tries to prank Courage again, but this time Courage outsmarts him in a really elaborate way. For example, Courage could set up a series of traps that lead Katz into a situation where he has to face his fears, just like he always makes Courage do.
Perhaps the Alice boy forms an unlikely alliance with some of the more mischievous characters in Wonderland. They could team up to outwit a powerful and tyrannical new villain that has emerged in the land. He uses his unique perspective as an outsider to come up with creative solutions to the problems they face.
One idea could be that Fire Boy and Water Girl find a magical forest where the rules of their elements are reversed. Fire Boy has to be careful not to extinguish himself in the overly wet areas, and Water Girl has to avoid drying up in the super - hot spots. They have to work together to find a way out of this strange forest.
A possible plot is that the body swap happens on a special day. The boy - turned - girl has to go on a date that the girl had planned. He tries to act as the girl but makes some funny mistakes. The girl - turned - boy has to participate in a sports event the boy was supposed to be in. They both start to see the world from a different perspective and learn to appreciate what the other gender goes through.
A really cool plot for a Beast Boy Titans North fanfic would be if there was a mystery in Titans North related to some ancient animal - themed artifacts. Beast Boy, with his connection to animals, gets drawn into the mystery. He could discover that these artifacts have the power to either enhance or disrupt his powers. Along the way, he also has to deal with his own insecurities about being different from the other Titans in North, as his powers are more nature - based compared to some of their high - tech or super - strength powers.
One idea could be a story where Batman and his dad work together to solve a mystery that has haunted the Wayne family for generations. They could use their combined intellect and skills to uncover secrets.
One idea could be that the knight has to protect his maidens from an approaching army. He uses his combat skills and strategic thinking to keep them safe. Another could be a story where the knight is on a quest to find a magical item to cure one of his maidens who is ill. And a third idea might be that the maidens have special powers and they help the knight in a tournament, which he couldn't win without them.