I have always envisioned that the next hero would be from the dark elixir side rather than the "goblin". A dark hero with a punch. I have seen the mention of a gargoyle before, and to be honest didn't read to far into it. However, instead of a base it gets its own tower...let me explain.
A fallen minion, wounded and left for dead, drowning in a pool of dark elixir rises in strength and CHAOS!!!! It must be kept and restrained in its tower, for if not your own town hall is in trouble. Welcome the Gargoyle. A massive flying unit of destruction. Like a clan castle this tower can be filled with minions, that when an enemy is in range they attack. The bad news is a gargoyle must protect its young, and when she does..it is pure devastation. Minions must be filled from clan mates. Only like 5 at first. The gargoyle will attack what attacks the minions. When they are dead it retreats. In clan wars the gargoyle can be loosed, but....she is also CHAOS she destroys to destroy. A berserk. Friend or foe it will destroy. Best if left until the end, or at all to win a star. it has both a positive and a negative. The tower can rest on top of say the town hall (will lower the amount of farmers). I would say a totally different defensive unit like tower, but th 9 and 10's are already lacking for walls. Like I said my first ever post and idea. Well, I need to go raid things....
PS. of course the hero power will be like that of the king and queen. Releases some minions and pure uncontrolled rage. NO HEAL!!!