If we are sticking to a steampunk theme and Edelstein's gear-shaped logo, one idea for a thief could be to use cog shaped bladed yo-yos to swing at enemies using complex tricks (i.e "walk the dog", "gravity pull", "around the world").
If we were to based a class of off Claudine, her whip and trickery disguises are more akin to a "Rakshasa"; Shiftshaping demons who are able to confuse and manipulate foes (like a puppeteer). Not quite sure how that would fit in with the whole steampunk Victorian era though.
