If you were chosen to be lead designer for the next game in a franchise of your choice, which would you choose and why?

Just a note: You don't need to choose already announced sequels or a direct sequel to the last game in the franchise. Like say you wanted to work on Halo 6 since 5 was just announced or work on the 9th generation of Pokemon games even though we're only in the 6th.

Personally, I would choose the Halo franchise. Not only is it my favorite game franchise, but I wasn't entirely happy with the direction they went in with Halo 4. As a huge Halo fanboy well versed in the Halo lore I feel like I would know where to take the story. And as a game design major I feel like I would be able to distill the gameplay down to what is Halo and drop all the CoD crap.