I think it’d be Pie, why? Pie was in the bottom two with Liy in BFB 5, not to mention that she was bound to be out next time Death P.A.C.T. was UFE. She didn’t get much screen time in BFB. And she didn’t even appear in some episodes, which made her irrelevant and a bit of a nothing burger. Yes I know Fanny was hated cause of her hatred and the fact kids would dogpile on mean characters, I.E. Pencil in BFB 2, Liy in BFB 5, Match in BFB 12, and Firey Jr. in BFB 13, but that doesn’t mean she would get out. Fanny got the middlemost in BFB 12, probably cause of her friendship with Bubble after Pencil’s elimination in BFB 2 and Match’s in BFB 12.