Would RIOT Ever Consider a Posession Themed Champion

Would RIOT ever consider adding a champion with a possession ability? Maybe not with full control of the other character, that would be too OP and would take fun away from the other player. But what if they could share a body with another champion and use their own abilities (or modified versions of them) from within the other champion? Or what if they could give their target stat changes, like increased or reduced damage taken (depending on if its an enemy or an ally).

It seems like it would be really cool thematically, although I won't claim to know how best to implement it for balance and fair counterplay.