preferred nickname: if he's 100% ahole he'll call her firecracker or faithy
horrible nightmare memories:

-watching her first watcher, diana, die via great big ol' vampire
-killing a deputy-mayor
-killing a volcanology professor (guilt to the point of knowing his daughter still visits the crater where the town she killed him in was)
-getting stabbed by buffy summers
-spending 3 months in a coma having nightmares about buffy hunting her down and killing her
-taking buffy's body for a joyride for a few days
-torturing her second ex-watcher for hours
-getting snacked on by angelus
-watching rupert giles die at angelus' (twilight's) hands
-watching her slayer trainee "die" at a crazy albino demon's hand
-various past slayers' lives and experiences (death by vampire's a pretty common theme, so)

secrets:

-most people don't know about her murderous past and the fact that she's an ex-con. also faith has various rooms she goes to with the purpose of just destroying as much crap as she can without much regard to her own wellbeing.
-she hasn't outright told anyone she's died once in wonderland (summerween) because it's nobody's business but also it's super embarrassing that she couldn't beat the dumb trickster.
-her dad wanted her to kill a guy for him but she just wound up lopping off his hand
-she tried to get a bad-memories lobotomy once

off limits: i thiiiink i'm game for anything! you seem cool and like i can hit you up if i realize oh shit i wasn't ready, so do your thing!
special defenses: maybe? faith reacts weird to dream stuff / has a tendency to shake off comas and fight out of near-death stuff if it's mental but it's never clearly defined and i don't think she does it actively. at most maybe bill can notice something's up with her?