Strange champion idea

I have a friend who plays a lot of console games with the goal of not killing anyone, even if that's what he's meant to do. I mean, he played watch dogs and beat it while only having to shoot 1 guy! But that gave me a cool idea for a champion. Especially since I like support roles, I think it would be cool to have a champion who cannot damage enemy champions. Skills and abilities would be towards buffing or healing allies, or incapacitating and slowing enemies. Auto-attacks could be things that reduce movement speed or attack speed, even lowering enemy damage but wouldn't do any harm to enemies or debuff them in ways that could increase damage they receive. The hero would be from a type of non-violent society that believes in not harming any living creature. This could make gold farm rough, but the passive could be along the lines of receiving gold when around minion or champion deaths to help in laning phases.

An idea for the ultimate would be that this champion can put a spell on an enemy champion. Once effected, the enemy will absorb any friendly fire for a certain period of time that happens to go through him at reduced damage cost. It could be called "Enemy Shield" and would work as a great counter engage to champions like Amumu and Malphite, where once they engage, if they don't get out of the way, they will absorb their allies attacks rather than going through them to the enemies.

I like the idea of this champion being sort of like a Shao Lin Monk Yordle. A small group of Yordles that live secluded from the others. The reason this champion joined the League is because he was sent on a mission to try and convert the other champions from their paths of violence, while trying to protect the allies he is with at the same time. May not be everyone's cup of tea, but I know I'd play that champ since I tend to gravitate to a more supporting play style to begin with.