User blog comment:YourPrivateNightmare/What's still left to do/@comment-24268958-20140703195031

A few I can think of off the top of my head:

A sand mage. A while ago we got some hints at a fellow code named Seth, and he was a sand mage. I feel as though with the Shurima stuff that's beingn teased this is definetly a strong candidate for a champion, be it a sand mage, sand tank, sand assassin, something sandy!

A large, charging beast: Be it some sort of Stag, Rhino, Elephant, or even a Dinosaur, some kind of huge behemoth creature that rampages around. I kind of imagine an ability like one of the iconic abilities of Spirit Breaker from DotA 2, where he can pass through all terrain and just charge on towards a target.

A holy templar: Some kind of holy fighter who uses a mixture of martial prowess and light power to beat the snot out of the more wicked champions on the rift. Probably something Demacia related.

That's all I've got for now, but those are my thoughts.