Well, a really cool 'a better boy fanfic' could be about him getting involved in a mystery. He stumbles upon a strange event or object, and he has to use his wits and skills to solve it. Along the way, he meets all sorts of interesting characters, and this journey of discovery could change him in unexpected ways.
One idea could be that Beast Boy discovers he has admirers from different dimensions. Each girl from these dimensions has a unique power and personality. For example, a water - controlling mermaid - like girl who is shy but drawn to Beast Boy's kind nature. Another could be a girl from a magical realm who is a powerful sorceress and sees Beast Boy's potential in a different way than others.
One idea could be exploring how his parents' personalities influenced Beast Boy's powers. Maybe his father was a scientist who was working on some genetic experiments that led to Beast Boy's unique ability to transform. Another could be a fanfic where his mother was from a tribe with a special connection to nature, which also played a part in his powers.
One idea could be to explore Ron's bad boy side in a different dimension where he's part of a secret rebel group against an evil force. He could have a cool new look, like leather jackets and spiky hair.
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.
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.
One idea could be Beast Boy going back in time to his younger self and having to deal with his past insecurities while still having his current powers and knowledge. Another could be an age - play scenario where he is magically turned into a child and his teammates have to take care of him and protect him from villains who might take advantage of his vulnerable state.
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.