Maybe in the fanfic, a young Decepticon who is starting to have doubts about the Decepticon cause meets Bumblebee. Bumblebee tries to convince the young Decepticon to switch sides. This could involve a series of adventures where they face challenges together and the young Decepticon slowly realizes the truth about the Autobots' noble intentions.
Well, a plot idea could be that there is a prophecy about Bumblebee and Megatron. It says that they will either bring about the end of the Cybertronian race or save it. This forces them to interact more and try to figure out what the prophecy means. Another interesting plot could be that Megatron's mind is somehow transferred into Bumblebee's body and vice versa. They have to live in each other's shoes for a while and this changes their views of each other. And then there could be a plot where a new technology is discovered that can end the war, but Bumblebee and Megatron have different ideas on how to use it, leading to a complex relationship and many conflicts.
One idea could be a bumblebee fanfic where Bumblebee gets lost on an alien planet and has to find his way back to his team while making new friends among the alien species. Another could be a story about Bumblebee's early days before he joined the Autobots, like his adventures as a young and inexperienced Cybertronian.
One idea could be a baby bumblebee getting lost in a strange new world on Earth and befriending a young human who helps him find his way back to the Autobots. Another could be baby bumblebee's first encounter with his own abilities and how he accidentally causes some chaos among the Autobots while trying to show off. Or perhaps a story where baby bumblebee discovers a hidden power within himself during a dangerous mission.
A time - travel plot could also be interesting. They could be sent back in time to an era when Cybertron was in a different state. There, they might meet younger versions of themselves or other important Transformers. This could change their perspective on their own history and relationship, and they might come back to the present with a new outlook on their rivalry.
One idea could be an OC Decepticon who has a unique ability like being able to control electricity. The plot could revolve around this OC trying to prove their worth to Megatron by taking on difficult Autobot missions. For example, they target an Autobot outpost that holds a powerful energy source. The OC's journey to the outpost, facing Autobot defenses and internal Decepticon rivalries along the way, would make for an exciting story.
A bumblebee human fanfic could involve a bumblebee that can talk to a human and they team up to save their shared environment. The bumblebee might tell the human about the importance of certain plants for its species and they work together to protect those plants from destruction.
One plot idea could be that Bumblebee and Arcee have to team up to protect a powerful artifact from the Decepticons. They start off not getting along well due to their different fighting styles, but as they face challenges together, they learn to respect each other and become a great team.
One plot idea could be that Bumblebee and Blitzwing are forced to team up during a crisis on Earth. They start off not trusting each other at all. Bumblebee is suspicious of Blitzwing's motives as he's a Decepticon. But as they face challenges together, they gradually learn to understand each other's strengths and weaknesses. For example, Blitzwing's triple - changer ability proves useful in getting them out of tight spots, and Bumblebee's speed and agility help in evading enemies. Another idea is a story where Bumblebee has to convince Blitzwing to defect from the Decepticons. This could involve Bumblebee showing Blitzwing the positive aspects of Autobot life, like friendship and protecting the innocent.
One plot idea could be that Bumblebee and Wheeljack have to team up to rescue a group of Autobots trapped by the Decepticons. They use their unique abilities, Bumblebee's speed and Wheeljack's engineering skills, to outwit the bad guys.
One plot idea could be that Bumblebee and Blurr are on a mission together. They start off bickering because of their different personalities, Bumblebee being more laid - back and Blurr being super - speedy and impatient. But as the mission gets tough, they learn to work together and rely on each other's strengths. For example, Bumblebee's creativity helps them get out of a tricky situation while Blurr's speed saves them from an enemy attack.