Yes, I have a couple. Sam would start off as a vanilla mortal but would eventually become an Emissary of Lucifer (he of course wouldn't know who his patron was for a while), Dean would stay as a mortal throughout though. They should have really good fighting skills of course, low resources, extremely high Lore, and stunts stunts stunts. Perhaps a Lore stunt called dad's journal that would give you a bonus to your Lore check. That is about all I would do with them. Sam might get Hellfire from his Emissary-hood but Dean wouldn't really get anything. Their Lore skill should allow them to do the binding rituals that they do because they aren't too magical, they just trap demons which should be a ritual that anyone could learn imo. Don't know if that helps out any, but that is my take on the Winchester boys.