Can't take credit for dimples. No less than three beta-readers suggested it as a potential irritating nickname for Faith. It was so good I had to use it.

As for Faith's stained rep in Baltimore? Ding-ding-ding. You've come close. Xander stopped it himself ("Robin's fried brain"). It's Faith throwing in with Xander and Spike after that which put a black mark against her, but it's more by association than anything she actually did.