@Riot; New Role Suggestion: General
Generals would be champions from all other Roles that sacrifice a bit of their power budget for a unique type of utility: They can interact with minions and structures, and have auras that buff their allies or debuff their enemies. Their playstyle would be fighter-esque. They either initiate fights, or are right in the fray when they happen. Their utility is ranged, but once they start fighting in earnest they have to switch to a close-combat fighting style.
I would suggest these three champions to be Generals:
Other options would be:

Examples for unique utility would be:
- Leona can mass-blind minions
- Aatrox can summon Banners of War (think Azir) above fallen towers
- Swain can transform allied minions into powerful Nevermores
- Jarvan's W spawns a second pulse around his standard that gives allied champions buffs (think Sona)
- Jarvan's standard briefly taunts allied minions to attack damaged enemy champions
- Hecarim leaves behind a trail that makes allies quicker (think Trail of Iron)
I'm going to make thread with actual rework suggestions, but I thought I'd make this separate first.