Thanks to everyone who has contributed so far. Getting a lot of good ideas to consider.
One thing that was especially under my radar was the idea of an, as of yet unactivated, Candy. Manipulative to (maybe) stay alive and then run away home after an activation of being a pain. This clocks especially hard on my radar since, unlike doppelgangers or stitched together, I actually already have her.
Sure it's not the OBVIOUS theme, but I don't see any good argument for why the murderous psycho girl couldn't team up with the murderous psycho mother
How terrible would you say it is to try and deal with a (still Manipulative) Candy with Fears Given Form and black blood (given by a shaman)?
Last time I used Candy she was too good. Deployment was close, so run away home pretty much let me unbury her within easy reach of the action every time.
Lot of other stuff is good as well. And yeah as has been pointed out, a lot of it is in the execution as well. The where and when. I just like to approach it from the angle of "which model am I using for this, and with that in mind, what sitations am I looking out for"