Numbuh 43 is one of the two operatives who appear at the end of Operation: P.I.N.K.E.Y.E. investigating Nurse Claiborne's disappearance. He is partnered with Numbuh 41 and is said to be "pretty good." He is also seen at the end of Operation: Z.E.R.O. at the gathering of operatives. He is a medium-sized boy with messy brown hair.