New Character Idea
There was a hero on the game called "Heroes of Newerth" which I thought was really cool becuase of one of the game mechanics involved in his ability. He was a dude on a rhino that could target an enemy hero from the spawn which would give the team vision of them. It would also charge across the map gaining speed. The faster you go the more damage you do and you knock back and stun on hit.
This is something that I could see alistar having, but this is a mechanic I have never seen in league. If you can make some kind of similar champion and use the same mechanic it would be a big hit. Would probably sell lots of skins and such too. You would have to make his charge ability restricted from using any movement speed runes or buffs from items.
's R (or ultimate or whatever) but, I don't believe that it deals knockback (and I'd know, Sion is my favourite character at the moment) however the whole across the map thing is an improvement, because sion has a limited range and steering isnt the easiest.