This is a tough one, assuming you mean I should pick a single one… it feels as though it’s tied between Mash and Ciel…
If you made me choose one, I’d probably pick Mash. If I’m gonna be pred, then I’d like my prey very subby. And Mash seems fun to poke and prod until her semi-professional demeanor is broken. Delicious kouhai having a nervous smile plastered on her face when she hears my stomach growl

For honorable mentions:
(I suppose most of my favs could make good prey, but I usually default to them being pred. Especially since soft doms tend to be my favorite archetypes)
Ciel, as I mentioned, was not actually I character I initially thought of as prey. I always saw her as a switch, because she’s been utilized as an unwilling prey very often (which is sad, i need more pred senpai…). But a pred leaning switch is how I see her. I’ve had someone suggest feeder Ciel stuffing me and then feeding herself to me after… you guys are simply too nice for indulging my weirdo degeneracy.
Since I talked about Uma Musume last time, I’ll subject you guys to more horse game nonsense. Sorry, I know it’s already crawling all over the general belly kink scene as of now. I’ve always seen Jungle Pocket as a bit of a bratty sub even outside of fetish content, and she naturally come to be prey in any fantasy she might come up in. Especially with Tachyon looking to annoy her… but that’s besides the point. I’ve seen some images where they give Jungle Pocket some more pronounced muscles… and it just makes me wonder how filling she’d be with a little meat on her bones.
Belno also comes to mind from Uma Musume, but I’ve talked enough about her already. Cute girl being endo’d by me, yada yada yada…
Manako from Mon Musume has put a curse on me, despite that series being completely terrible by all standards and accounts, her and Tionishia have been stuck in my head forever. We won’t have to worry about Manako getting self conscious or bumping into anything with her poor depth perception if I just have that cyclops girl as a snack…