Speaking of that, you know what I really want? A champion that's two champions, who you control completely through normal mouse and Alt+Mouse the same way you do so with Morde and his captured adc. Make it two yordles who are brother and sister, one ranged and one melee. They both have magical gems inside of them that keep each other alive, and if they aren't together they can't survive. The melee guy is the big brother and has 100% the hp that a regular champ has, but the ranged girl is young and only has 25% and if she dies then the other one does too. But she's still supremely badass.
And as a passive, if one of the two of them die, the survivor goes into a rage and gets a huge movement and attack speed buff for 6 seconds to try and avenge them, before dying themselves.