As you read this - I must tell you first and foremost that I am trying my best to take as little inspiration from Bayformers as possible. I mean, sure, I might port incarnations of characters introduced in the movie continuity but that's that. This will primarily take inspiration from the Transformers Prime and Transformer RID 2015.

Alright, the start of each idea is practically identical. Cybertronian War, blablabla, both sides lose, Autobots find way to Earth, Decepticons find way to Earth too, and then the story can start.

1. Pokemon Crossover. Optimus Prime and his crew lands on the Corvix Region, a region that has pretty low tech. Low tech means less media attention, so they can use this region to set their hideout, build their Groundbridge and stuff. Also they take the form of Pokemon as opposed to vehicles.
My main conditions are - Optimus and Megatron must be opposing Legendary Pokemon, preferably Reshiram and Zekrom. Also Fossil Pokemon are reserved for Dinobots.
Legendaries can be playable characters who might help or hinder the Cybertronians, but they cannot be owned by trainers.
It is possible for Cybertronians to take the form of Legendaries, but preferably not because... YOU KNOW THE PUNCHLINE
ROBOTS IN DISGUISE
DISGUISE
You can decide which era this'll be - Medieval or Modern.
I will play Optimus in this.

2. A Fantasy Setting with mythical creatures. The Cybertronians take the form of mythical beasts. I would prefer for Optimus and Megatron to be opposing Mythical Beasts, like Tiger vs Long, Phoenix vs Dragon, etc.
Humans have magic. Magic exists. In altmode, Cybertronians can use some extent of magic.
I will play Megatron in this.

While their concepts differ, their plot plans are somewhat similiar. Especially with relic-hunting.

So, who's up?