To understand where i'm going with this, play my war3 map: http://epicwar.com/maps/117817/
and pick my tree guardian hero.
He is a tree that actually puts treants on his different body parts to use as a shield.
like he will put a treant on each shin or each arm or have one sit on top of his head. lol and he uses it like armor and they absorb parts of his damage.. and when they have been exhausted.. they die and fall off his limbs, leaving him more vulnerable again.
I think a hero like this.. but perhaps with the use of magnets... could be cool in LoL.. where you stick creeps to your body.
and maybe do other magnet-like things by sucking or repelling or moving enemies or allies around the field.