@Meddler: On the subject of giving immobile mages a distinct identity...

I have one thought on a design that would really fit the bill: A "swarming" mage.

In essence, think of a Zerg Swarm Host from Starcraft 2 on Stimpacks. You'd basically root yourself to the ground, and then send virtually endless waves of minions at a target location to siege down a position. Great for pushing, sieges, and objective control, but bad at team fights, picks, etc.

NOTE! Malzahar doesn't count, as his Voidlings are mostly an add-on for his kit (except in AD Malzahar builds), and don't reach Zerg levels of swarming.

Would this be a cool identity for a potential future League Champion?