Any ways to make a pacifist character?

A friend of mine is making a rom hack and I when they said one of their characters was a pacifist I thought they could make them similar to Raquel from Tear ring saga, where they can’t kill enemies and then maybe after some events of the game they are able to do so

I would really appreciate it if any of y’all found a way to do so

also the mercy doesn’t work in this game because they are using SOV spells so they are picking an action other than mercy to deal damage

For clarity’s sake, I’m assuming you’re talking about a unit that belongs to a combat class, meaning it can’t be a fully support/utility class like a dancer or a priest?

Yeah in this case its a infantry mage unit for clarity’s sake