A very loose concept just to throw it out there
So I was thinking about the Demacian standard and how it gives a stat buff in an area and I thought it would be cool to have a champion with a war cry or some kind of ability that did something fun and balanced to rally teammates in a certain area. He could specialize in demoralizing foes and rallying his teammates, getting a bonus for every allied minion near him, ect. I'm not even sure it's viable or fun, but the concept of a champion character is commonly visited in many games.