Negative Numbuh 5
Negative Numbuh 5 is Abigail's dorky evil counterpart who wears braces and glasses, appears to have buck teeth, and hates lollies. She carries a S.P.L.A.N.K.E.R. that looks like it's made of metal, and instead of a magnet, there is a spring. When she suggests they attack positive Wallabee, she says it with a lisp.
- Her name might be Liagiba "Ybba" Nlocnil, though it is unknown.
- She may be a parody of Chuckie Finster (Rugrats).
- She is similar to the nerdy, dorky Abigail when her coolness was taken away in Operation: C.A.R.A.M.E.L..
- Her glasses might have been inspired by the reading glasses that Numbuh 5 uses in No P in the Ool.