Perhaps Bell Cranel is betrayed by someone he trusts in a love interest situation within the fanfiction. For example, his romantic partner might be using him for their own gain and then betrays him when they get what they want.
In the 'bell cranel betrayed fanfiction', it could also be that Bell Cranel is betrayed by an authority figure. This authority figure, like a guild master, might have promised Bell certain things but then goes back on their word and betrays him for the sake of the guild's reputation or some other self - serving reason.
It could be a character from a rival group. They see Bell Cranel as a threat to their plans and so they betray him by setting him up in a dangerous situation.
One type of fanfic could involve Bell being betrayed by his comrades in the dungeon. Maybe they get jealous of his rapid progress and leave him in a dangerous situation. For example, they might take his equipment and run when a powerful monster appears, making him feel extremely let down.
One possible scenario could be a character being betrayed by a teammate. For example, Ruby might be betrayed by Weiss if Weiss is lured to the dark side by some powerful and evil force. This could lead to intense battles and emotional turmoil for Ruby.
One great Bell Cranel and Freya fanfiction is 'Freya's Obsession'. It delves into Freya's complex feelings for Bell in a really interesting way. The author does a wonderful job of portraying Freya's allure and Bell's naivete.
Well, in this type of fanfiction, it might be that Twilight Sparkle is betrayed by a mentor figure. This mentor could have been teaching her false information all along, causing her to make mistakes that put her and her friends in danger. Or it could be that she is betrayed in a love - related situation. For example, if she has feelings for a certain pony and that pony pretends to reciprocate only to use her for something else, like getting access to the library in Canterlot. There are so many directions this fanfiction could take.
Well, it could be that Draco betrays Hermione's academic trust. Since they are in a world where magic and knowledge are highly valued, he might steal her research or ideas for a spell or a magical discovery. This would be a huge betrayal as Hermione values her intellectual pursuits greatly. Also, he could betray her trust regarding a secret mission they are on together. He might abandon her in a dangerous situation, like in a dark forest full of dangerous magical creatures or in an old, enchanted castle filled with dark magic traps, just to save his own skin.
Perhaps in the fanfiction, Danny is betrayed by a new ally he trusted. This new character could have joined Danny in his fight against evil ghosts, but in reality, they were working for a more powerful and evil ghost all along. They might use Danny's trust to learn about his weaknesses and then expose him to danger, leaving Danny feeling hurt and alone, having to reevaluate who he can trust in the future.
Perhaps in the fanfiction, Naruto is betrayed by a new character introduced. This character could be very charming and deceive everyone in the community into thinking Naruto has done something wrong. The character might be secretly working for an old enemy of Naruto's. They could fake evidence of Naruto's betrayal, like showing false images or documents, which would cause the community to turn their backs on Naruto.
One possible scenario could be Naruto being forced into a situation where he has to seem to betray Sakura to protect her from a greater danger. For example, he might be blackmailed by an enemy into staying away from her or acting against her interests.
Love is also a common theme. There are many fanfictions that explore Bell's romantic relationships, whether it's with Ais or other characters. Adventure is another prevalent theme. Bell is known for his adventures in the original story, and fanfictions often take him on new and exciting adventures, sometimes to unexplored parts of the world.