Tarantulas is an interesting character to include. He has his own devious plans that often intersect with Megatron's, sometimes as an ally and sometimes as a rival. Tigatron, with his connection to nature and his more spiritual side, can bring a different perspective to the story. And Waspinator, for his comical yet tenacious nature. Despite being often defeated, he always comes back, and his interactions with Megatron can be both humorous and revealing of Megatron's character.
Often, other Decepticons like Starscream might be involved. Starscream, always vying for power, might see Megatron's condition as an opportunity to finally take over. So he could play a major role in the fanfiction, either causing trouble or having a change of heart. And then there could be some human characters who get caught up in the events, perhaps scientists or soldiers who are trying to understand what's going on with Megatron.
" Megatron Mountains and Rivers " was a thrilling time-travel novel with ups and downs. There were two versions of the novel. One was written by Li Zhi, and the other was written by Ye Xiao and Ye Qianxue. Li Zhi's version of the novel was finished. Ye Xiao and Ye Qianxue's version of the novel was about how their sister was bullied by the enemy. When Ye Xiao heard the news, he led millions of Luosha soldiers and went down the mountain to overturn the entire Yunhai City. The plot and writing style of this novel were excellent. It was a very good transmigration novel. If you like this type of novel, I recommend you to read Megatron.
One great Bumblebee and Megatron fanfic could be about their unexpected alliance. Maybe in a universe where they have to team up against a greater threat. They start off distrusting each other but as time goes on, they learn to respect one another's skills.
To create believable character development for Megatron, consider his past. Maybe he had some experiences with humans in the past that were either positive or negative but were buried deep. In the fanfiction, these memories could resurface due to an encounter with a particular human. As he interacts more with this human, his views on the entire human race could start to shift. For instance, if he once had a human friend as a young Transformer but lost them in a war, meeting someone similar could reignite those old feelings and make him more empathetic towards humans.
If Naruto was a Megatron fan, he might become more assertive. Megatron is known for his strong leadership and determination. Naruto could adopt some of these traits, becoming more confident in making decisions and leading his team. He might also be more willing to take risks, like Megatron does in battle.