Numbuh 363 (Harvey McKenzie) is a small cute boy and he is the younger brother of Numbuh 362 and leader of Sector W. He is voiced by Alexander Gould. He was introduced in Operation: Z.E.R.O., where he was seen taking a tour of the Kids Next Door Seriously Cool Museum of Artifacts and Stuff along with his teammates Numbuh 83 and Numbuh 84. Like his sister (and most other operatives), he does not believe that Numbuh 0 exists. He has a brown hair, freckles, very large buck teeth, dark purple pants, darker purple sweater and black and white chunks. The dentist did check Numbuh 363's large teeth.