Make another champion controlled by Zyra
I think that it would be an amazing idea for another champion to be something (doesnt have to be human) controlled by a Zyra plant. They could look very different in appearance and have a totally different skillset but keep with some sort of plant theme.
This would also allow for Zyra's lore to FINALLY be flushed out more and "rooted" in Runeterra ;)