Doppleganger Thematics / Quests

Can we have some cool toys for normal games with two of the same champion fighting eachother?

In the form of a "kill your doppleganger" quest, or a special effect. Ex. If two Ashe arrows collide with eachother, there's a huge frost explosion that freezes everyone across the map for a few seconds. Jayce blasts collide, Jinx rocket collides, Ezreal, etc.