I was watching the first Bourne movie again and The Professor's lament, "Look at this. Look at what they make you give," really stuck with me. Here's the clip:
https://www.youtube.com/watch?v=cSZdpW3zy18
Thinking about street vigilantes, and not the ones who come with unlimited bags of money, but the ones who do the work and end up having to give up their lives to avoid the endless hit squads who inevitably come after you when you disturb too much sh!t. So it's about what you have to give...the cost. The Punisher comes to mind.
The second idea that shapes the narrative will be the Corruption rules for Fate Accelerated presented in the Fate Codex v2n2. This makes me think of the Dark Side of the Force, and how it changes you. As you turn to the "dark side" (it won't be the Star Wars Force in our game, so this is just by way of comparison), you gain corruption and you are changed.
Fate Codex v2n2:
Corruption changes you in a fundamental way.
Accepting corruption should grant you an overwhelming immediate advantage.
Corruption should allow you occasional advantage with out taking on more corruption.
Corruption sometimes causes you to act against your own interests and better judgment.
Redemption is possible, at high cost.
In game, it won't manifest as something Other, but more like what the war on crime takes out of you. What corruption does, for instance, is changes your Approach. If you took corruption on your
Quick approach, it gets renamed to
Reckless and you roleplay your character a little differently while you have the corruption. You can, of course, redeem yourself and remove the change.
Thoughts?