What if we had purchasable finishing moves which procked on a purple kill giving you a small 3-5 second animation (similiar to fatalities in mortal kombat). To not effect game speed this could maybe be only for when you get a purple kill to win the game and not every purple kill.
Not sure the best way this would be implemtend as we already have the short animations for when you win a game already but I think if done right this could be a fun cosmetic people would buy to make their character feel more personalized.