As long as we're floating ideas, I wonder if I couldn't spin a matched pair of a scion and a rogue to you. I know you pointed out that you didn't want one that was the servant of another or something, but I have them imagined as something of a conjoined pair that hate each other. To be specific, I was imagining a scion in the form of a sentient, malevolent sword being wielded by a more grey character. The latter would be more my "character" and I would only be writing his CS, as the sword obviously has far less agency. Perhaps she's trapped in that form as a "punishment" from Chernobog... anyway, I have ideas.