Maybe there's a plot where Batman discovers an ancient artifact in the Batcave that has the power of the Beauty and the Beast story. It curses him, and he starts to show more beastly tendencies. Meanwhile, a young woman who is an inventor and a big fan of Batman, tries to create a device to reverse the effects. As she gets closer to Batman to study the curse, they develop feelings for each other and work towards breaking the curse.
One interesting plot might be that Gotham is transformed into a desolate, enchanted place. Batman is the only one who can save it, but he is also affected by the dark magic, becoming more beast - like. A foreign princess who is visiting Gotham for diplomatic reasons gets lost in this new, dark Gotham. She and Batman cross paths, and she starts to understand his pain and his noble cause. They form a bond and try to restore Gotham together.
A plot could be that Batman is cursed by a new villain in Gotham who has magic powers. This curse makes him look more menacing and animal - like. A girl, who is an expert in ancient magic, comes to Gotham to study. She meets Batman and decides to help him break the curse. As they work together, they fall in love.
Well, a cool fanfiction concept could be that Belle discovers a hidden part of the castle that holds the secrets of Beast's past. As she uncovers these secrets, it deepens their relationship even more. Or perhaps a story where Beast gets turned human for a short time and he has to adapt to the human world without Belle by his side at first. He then realizes how much he truly depends on her. Another interesting one would be a fanfiction where Belle's father gets lost in the enchanted forest again, and Beast and Belle have to go on a new adventure to find him.
One way to blend Batman and Beauty and the Beast fanfiction could be to set the story in Gotham. Batman could be the 'Beast' in a sense, isolated in his dark cave - the Batcave. A new character, like a female journalist, could be the 'Beauty' who stumbles upon his world. She might initially be afraid but then start to see the good in him, much like in the original Beauty and the Beast story.
One interesting plot could be the sons teaming up to solve a mystery that Batman himself has trouble with. They might use their unique skillsets, which are different from Batman's, to approach the case from a new angle.
An interesting OC for a Beauty and the Beast fanfiction could be a talking animal servant in the castle who has their own unique perspective on the curse. They could befriend the Beast in a way that no human has before and help him see things from a different angle. Or perhaps an OC who is a forest spirit that is drawn to the magic of the castle. This spirit could interact with both Belle and the Beast, guiding them towards true love. A third idea is an OC who is a young inventor like Belle's father. This character could bring new inventions to the castle that either help or hinder the situation with the curse.
One idea could be exploring the Beast's past more deeply. Maybe a story about his life before the curse, his relationship with his family and how it all led to his current situation.
One idea could be that the characters from Glee perform a musical version of Beauty and the Beast within the Glee club setting. They could assign roles like Rachel as Belle and Finn as the Beast. Another could be a crossover where the Beast from the fairy tale somehow ends up in the Glee universe and has to learn about music and friendship from the Glee kids. And a third idea might be that the Glee club does a fundraiser by putting on a modern - day retelling of Beauty and the Beast, with unique twists on the characters and their relationships.
Well, some fanfictions might be about Belle's friends from her village coming to visit the castle. They could be initially scared but then slowly get to know the enchanted objects and the Beast. A different type could be a story where the Beast and Belle go on adventures outside the castle. They might encounter other magical creatures and have to work together to overcome challenges. And then there are those fanfictions that give a backstory to the enchantress who cursed the Beast, exploring her motives and history.
One idea could be that Belle discovers a hidden garden in the Beast's castle that has magical plants which can talk and offer her advice. Another could be a backstory for the Beast, like how he got cursed in a more detailed and different way than in the original story. For example, he was tricked by a jealous wizard who wanted the castle for himself.
Perhaps a plot where the Pokemon mother beast is in danger. Some evil organization wants to capture it for its powerful abilities. A young trainer then decides to protect it, embarking on a dangerous journey filled with battles and challenges.
One interesting plot could be baby Beast Boy's first encounter with other Titans as a baby. Maybe he accidentally turns into different animals and causes chaos in the Titans' tower in a really cute way.