A champion that deals no damage

PREMISE Alright, so I have been reading some really cool manga that have a cool idea for a main character (Vegabond, Vinland Saga). It's something like this:

A man who used to be the best of the best in terms of killers is now a pacifist.

How weird and cool would it be to design a champion that makes up for pacifism (literally dealing no damage) through the use of abilities. This is just an experiment... what powering would be necessary to make it viable but not overpowered?

Think like this - the character is a "true warrior." That takes the idea of healing away.

Abilities

First off, the passive would be the only straight up negative passive in the game. Thou shalt not deal damage. So weird, but allows for his power to be in other things. If this is too much, some other ideas are welcome. An idea around this could be a rage system, where too much damage taken by himself or his allies throws him off balance, bringing him back to the days where he was a killer and he starts to deal damage again.

For the Q, one of my favorite things in League is the way champions can change the positions of other champions, from Thresh's lantern to save allies to Alistar's headbutt to knock an enemy out of position. Idea for one basic ability is to push/pull a champion. The way to control the direction could be like Rumbles ultimate. In order to make this stand out, lets say it runs on an ammo system like Caitlyn traps.

Lets say the W adds the possibility is to make all of his attacks ministun, similar to the way Nautilaus' passive used to be.

The E could be a dash or some other mobility thing. Hell, lets give it an ammo system, too.

As for the ultimate, I am open to suggestions. It could run off the rage system instead of his passive. The damage dealt would lead to a single target close ranged nuke, but if we are staying on the no damage dealt idea (which is fun to me, at least) it would have to have some sort of major impact. Maybe it adds to his survivability. But not like Alistar ultimate - that would be normal and boring. Nor like Kayle's ultimate. Maybe it could be something like Nunu's ultimate, in the utility way, and not the damage way.