For a pacifist inquisitor in Dragon Age fanfiction, start with their backstory. Perhaps they come from a region that has suffered greatly from war, which led them to their pacifist beliefs. In their character arc, show how they adapt to the power they hold as the Inquisitor. They could use their position to promote peace treaties and cultural exchanges. However, they will face opposition from those who think the Inquisitor should be more forceful. As they progress, they might learn that there are times when a more assertive approach is needed, not in terms of violence, but in standing up for their beliefs. This evolution of their beliefs and actions can make for a very interesting character arc.