For me, SSC Red Sonja: Queen of Scavengers. Such a beautiful piece, but while I know of her as a character, she's not one I have strong ties to. She doesn't fit anywhere in my collection. But she's so gorgeous.
I actually love Catwoman as a character and I find this DCC piece very beautiful. But this doesn't really fit in with my collection either no matter how hard I try to figure out a way. Also being 1/8 instead of the usual 1/6 throws things off even more. I keep thinking maybe I can buy her for my wife, but this doesn't fit her collection either.
I've loved this TH Pennywise since I first saw him at SDCC a few years ago. Now that I'm tightening my focus, he's beginning to fall by the wayside. He doesn't really fit with anything else and I'm not a fan of squatting poses for pieces.
Probably my 2nd favorite Batman piece ever produced, this P1 Noel has been something I've considered forever. I would've gotten him at the P1 holiday sale earlier in the year if it wasn't for the crazy shipping they had attached. Space is running slim and even though I really love this piece, I'm unsure if it's one I need to own or not.
There's tons more that aren't coming to mind at this moment, but this is a good place to stop.