Games you'd like to try a different genre?

Title says it all, any popular video game franchise you wouldn't mind at least 1 installment that was a different genre?

Examples :

Mortal Kombat RPG

Kingdom hearts fighting Game

etc?

A Batman Arkham RPG would be interesting; I would love to make my own Gotham hero.

Halo doing a similar genre to Mass Effect. It has the lore and characters to have one, like them.