User blog comment:Eobard95/Professor Stein dying - Ronnie returning?/@comment-1330227-20171002233510

Lily would be cool as that would be something not done in the Arrowverse yet with a male and female combining to become Firestorm. They could get some good stories from that. Ronnie would also be cool, and if they can transfer main characters to other shows midseason, maybe instead of transferring Jax to The Flash, they could transfer Caitlin to Legends. Another possibility could be Jason Rusch.

As for who to fill the Firestorm spots if Stein dies and Jax goes to The Flash, It'd be cool if it were Roy Harper. They made it so that he can't show if face anymore so why not send him off on a time ship?

Dinah would be cool, but I think they can make it work on Arrow with both her and Laurel. Flash has Barry and Wally and occaisionally Jesse, and occaisionaly Cisco and Gypsy. Arrow had Oliver and Roy for a season and a half and Oliver and Thea for a season. Arrow also has Spartan and Wild Dog. Smallville had Clack and Kara for season 7.