One idea could be that Belle's transformation into a beast is a result of a curse placed on her by an envious witch. As a beast, she has to learn to control her newfound strength and anger. Another plot could involve Belle finding other cursed creatures in the forest and forming a sort of 'beast community' where they all support each other in trying to break their curses. Maybe Belle's journey as a beast also makes her understand the Beast from the original story on a deeper level, and she uses that knowledge to find a way to reverse the curse not just for herself but for all the cursed beings.
Perhaps in the fanfiction, Belle becomes a beast due to a magical experiment gone wrong. She then discovers that she can communicate with animals in a different way as a beast. This leads to her going on a quest to find a special flower that can reverse the transformation. Along the way, she has to battle with her own self - image and the prejudice of others. She might also meet a mysterious wizard who gives her clues about how to break the curse, but she has to complete difficult tasks to earn the final solution.
One idea could be exploring the backstory of the beast in more detail. Maybe he had a different life before the curse and his past relationships or adventures could add depth to the fanfiction. Another plot could involve the belle teaching the beast about a new culture or skill she has, like a unique form of art or a different language.
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 idea could be a 'what if' scenario where Gaston has a change of heart. Maybe he realizes Belle's kindness towards the Beast makes her truly special and he tries to make amends for his past behavior. He could start by helping the villagers understand the Beast better instead of leading them to attack the castle.
One interesting plot might be that Gaston somehow gets transported into the enchanted castle with Belle. He then has to learn to live with the enchanted objects and the Beast. This could lead to humorous situations as Gaston tries to assert his dominance in a place where his usual tactics don't work. At the same time, Belle could see a different side of Gaston as he struggles to adapt, and it could change her perception of him too.
One idea could be Belle exploring the castle gardens barefoot and discovers a hidden part of the garden that has magical plants. Another could be Belle having a barefoot dance with the Beast in a moonlit ballroom. Or perhaps she goes on a barefoot adventure outside the castle and meets some friendly forest creatures who help her understand the Beast better.
A possible plot is that the tavern Belle works in is frequented by hunters who often talk about the Beast. Belle, being the curious and intelligent girl she is, starts to question their motives and the truth behind their tales. Meanwhile, the Beast, in his loneliness, sends his servants in disguise to the tavern to observe Belle. As the story progresses, Belle might get into trouble with the hunters when she defends the Beast, and the Beast has to come to her rescue, starting their relationship in a more action - packed way.
Maybe in the fanfiction, there's a threat to both their kingdoms. Mulan, with her combat skills, and Belle, with her intelligence, team up. They use their unique strengths to outwit the enemy. For example, Belle deciphers the enemy's coded messages while Mulan leads the defense. They also learn from each other's cultures along the way.
Maybe Belle gets lost in the jungle where Kaa lives. Kaa at first thinks she's an intruder but then realizes she's different. He helps her find her way back home by using his knowledge of the jungle paths. Along the way, they form an unlikely friendship and Belle teaches Kaa about the outside world.
One interesting Belle and the Beast fanfiction could be where Belle discovers a hidden magic library in the castle that holds the secrets of the Beast's past. It could show how this new discovery deepens their relationship as they explore the library together.
One idea could be that the baby has a special power that tames the beast. For example, the baby's laughter might have a calming effect on the usually fierce beast.