Perhaps they get transported to an alternate dimension where they have to rely on each other to survive. In this new place, they find out things about their pasts that they never knew before. Silverbolt might learn about Blackarachnia's reasons for being the way she is, and she might see that he is not just a naive goody - two - shoes. This could lead to a deeper understanding and a possible change in their relationship.
One plot idea could be that Blackarachnia and Silverbolt are forced to team up on a mission in a dangerous part of the Beast Wars world. They initially clash due to their different personalities and allegiances but gradually come to understand and respect each other.
One idea could be exploring Blackarachnia's past before the Beast Wars. Maybe she had a different life or purpose that got derailed. Another could be a story where she forms an unlikely alliance with one of the Maximals, like Cheetor, and they have to work together to overcome a common threat. Or perhaps a fanfic that delves into her relationship with other Predacons, like how she might be trying to gain more power within their ranks while also dealing with her own internal conflicts.
It could also develop if they face some sort of internal conflict. Say, Silverbolt has to choose between his loyalty to his group and his feelings for Blackarachnia. And Blackarachnia has to decide if she can trust Silverbolt. Through these conflicts and how they resolve them, their relationship can grow in complex ways. Well, like in a situation where Silverbolt defends Blackarachnia from an unjust accusation from his comrades. This could make Blackarachnia question her view of him and start to open up to him more. And for Silverbolt, he might see that she is more than just her actions and start to see the potential for good in her.
Another way would be if Blackarachnia had a change of heart earlier in the story. Instead of being so focused on her own goals, she could be more open to Silverbolt's ideas. This could lead to a quicker and more harmonious relationship development, with them sharing their knowledge and skills to achieve common goals.
One interesting plot could be Beast Wars Megatron getting his hands on a powerful ancient artifact on Earth that gives him an edge over the Maximals. This could lead to a series of battles where the Maximals have to figure out how to counter this new power. Another idea is a fanfiction where Megatron forms an unlikely alliance with a small group of Maximals to face a greater threat from a third, previously unknown faction. This would be full of tension as they try to work together while still being enemies at heart.
Perhaps a story set during the Clone Wars where the Republic discovers a way to control the Zillo Beast and uses it as a weapon against the Separatists. But things go awry when the Beast breaks free from its control and starts wreaking havoc on both sides of the war, forcing the Jedi and the clones to find a new solution to stop it.
One idea could be a crossover where the characters from Transformers Prime end up in the Beast Wars universe. They could form alliances with the Beast Wars characters to fight a common enemy like the Predacons. Another idea is to explore the origin stories of some of the Beast Wars characters within the context of the Transformers Prime lore. Maybe there's a hidden connection between a Prime character and a Beast Wars character that could be uncovered.
Perhaps Vergil is from a parallel dimension where the Devil May Cry world and the Transformers Beast Wars world are already intertwined. He comes to the Beast Wars universe to seek a powerful artifact that could help him in his own dimension's battles. Along the way, he forms unexpected alliances with both Autobots and Maximals, and his presence changes the course of the Beast Wars as the different factions either see him as a threat or an opportunity.
One idea could be exploring a hidden planet during the Dark Voyage. The Maximals and Predacons could discover a new energy source there that changes the power dynamics. Maybe there are ancient Transformers on this planet with unique abilities.
One idea could be creating an OC that is a hybrid of two different Beast Wars species. For example, a half - Maximal, half - Predacon. This OC could struggle with identity issues as they don't fully belong to either side. Another idea is an OC with a unique power, like the ability to control plants in the Beast Wars world. This could add an interesting dynamic as they interact with the other characters and the environment.