How I would write Firestorm into Legends Of Tomorrow of Robbie Amell stayed on as Ronnie Raymond
In Legends of Tomorrow, Firestorm is comprised of Jax Johnson and Martin Stein, because Ronnie was killed of since his actor didn't want to be a series regular on Legends. I honestly liked Ronnie Raymond as a character more than Jax Johnson, so here's a brief overview of how I would write him if he decided to join for 1 season before leaving. First of all, since Jax and Ronnie are both engineers, Ronnie would take the role of engineer of the Waverider that Jax had. Secondly, at the end of season 1, instead of Captain Cold sacrificing his life, Ronnie would, so Jax could be introduced in season 2, and Captain Cold and Heatwave could go back to being the Rogues in The Flash season 3.
The only real issue I have with this is why Ronnie would willingly leave Caitlyn to join the Legends.