HOTS has a hero called "Cho'Gall"
Cho'Gall is a dual character like no other.
Have you heard of the lost vikings? They are a hero where the player who picks them controls 3 units seperately.
Cho'Gall is the opposite. With him, two players control the same character. One plays as Cho, a durable behemoth who controls movement and deals massive damage. The other plays Gall, a mage who is literally attatched to Cho, and brings lots of heavy ranged damage to the table.
In exchange for losing a hero, Cho'Gall has incredible power squeezed into one hero.
Would this kind of thing be possible in League? Because that seems like it would be hilarious.