A plot could involve Bumblebee getting damaged and losing his memory. The RWBY characters find him and try to repair him while also helping him regain his memories. As they do this, they learn about the Transformers universe and Bumblebee starts to adapt to the RWBY world, eventually using his unique abilities to help them in a big battle against a powerful Grimm horde and a new villain that has emerged.
Here's an interesting plot. Bumblebee discovers a portal between the Transformers world and the RWBY world. He decides to explore the RWBY world out of curiosity. Once there, he is mistaken for a new type of weapon by some of the less - scrupulous characters in the RWBY universe. Team RWBY has to rescue him and in the process, they learn about his true nature. Together, they then have to close the portal to prevent other, more dangerous Transformers or threats from the Transformers world from entering the RWBY world.
Maybe a fanfiction where Dark Energon is being used to power a new super - weapon, and Bumblebee has to infiltrate the Decepticon base to stop it. Along the way, he discovers some secrets about the origin of Dark Energon and its connection to the Transformers' past. This would be an exciting plot full of mystery and adventure.
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.
There could be a fanfiction where Bumblebee loses his memory. Arcee takes it upon herself to help him regain it. She takes him to all the places they've been together, shares their memories, and tries to jog his memory. As she does this, she also realizes how much Bumblebee means to her and how important their relationship is. This is a story about friendship, loyalty, and the power of memories.
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 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.
One idea could be that Prowl and Bumblebee have to team up to solve a mystery on Cybertron. Maybe there are strange disappearances and they suspect a new Decepticon plot. They start investigating together, with Bumblebee's energetic nature contrasting Prowl's more reserved one, leading to some humorous and tense moments as they try to figure things out.
A plot idea could be that Bumblebee is the only one immune to the negative effects of Dark Energon. The Autobots use this to their advantage and send him to infiltrate a Decepticon base where Dark Energon is being weaponized. He has to pretend to be under the influence of Dark Energon while gathering intel and sabotaging the Decepticon's plans.
She could be a spy within the Decepticon ranks. Pretending to be on their side while secretly feeding information back to the Autobots. Her small size and ability to transform into a less - conspicuous vehicle would make her perfect for this role.
Maybe the Transformers end up in Remnant due to a space - time rift. The Grimm might be attracted to the Energon that the Transformers carry. The RWBY teams would have to team up with the Transformers to fight off both the Grimm and the Decepticons if they also show up. Yang could learn some combat moves from the Autobots, which would add a new dimension to her brawler style.
One idea could be a crossover where the Autobots from Transformers Prime end up in the world of RWBY. They could team up with the RWBY characters to fight a common enemy, like a new type of Grimm that has some technological abilities similar to the Decepticons. The Autobots' advanced weaponry and technology would be a great addition to the RWBY universe's combat.