what could a rogue of time do offensively? i haven't been able to think of much

You could Argue that ‘Stealing someone’s Time’ and redistributing it could have aging or de-aging effects on people. Freezing someone in time and allowing people to walk in frozen time also sounds Roguish enough, and much like the Thief, as I’ve said in the past, I argue about the possibility of skipping bits of the TImeline by stealing Time and nullifying events that happened during those moments like King Crimson.