A champion that buffs towers and upgrades them?
I was just thinking that League could use a champion that works around fighting with objectives and safe guarding them (upgrading tower damage, health, armor). This champion would be completely niche against champions like
basically any split pusher. Could be a support and top laner perhaps.
can already interact with towers with their ult and E respectively, but I guess you are talking about a long term upgrade? if that's the case my vote goes to 
but would need to replace his ulti if its a permanent change to the turrets stats.