He debuted in 1963, and continued to appear on and off in the strip until 1981. "5" has spiky hair and sometimes wears a shirt with the number five on it. 95472 is the family's "last name", or more specifically their ZIP code. In reality, it is the ZIP code for Sebastopol, California, where Charles M. Schulz was living at the time the character was introduced. "5" has to keep telling his teacher that the accent is on the 4 in his surname. Snoopy is confused as to whether the boy's name is spelled 5 or as the Roman numeral V.
As "5" once explained to Charlie Brown, his father, morose and hysterical over the preponderance of numbers in people's lives, had changed all of his family's names to numbers. Asked by Lucy if it was Mr. 95472's way of protesting, "5" replied that this was actually his father's way of "giving in." "5" also has two sisters named "3" and "4". ("Nice feminine names," in Charlie Brown's sarcastic assessment.) It can be assumed that their parents are named "1" and "2".
Before Peppermint Patty's debut, "5" was in the same school as Charlie Brown and Linus. A few years after Peppermint Patty's first appearance, "5" was shown sitting in front of Roy at Peppermint Patty's school.In later years, "5" appeared more as an occasional background character and disappeared entirely after May 22, 1983.
"5" appears, along with his sisters, in the TV special A Charlie Brown Christmas, all as silent characters. "5" also appears as a silent character in the special You're Not Elected, Charlie Brown. He has a spoken part near the end of He's Your Dog, Charlie Brown and It's Flashbeagle, Charlie Brown, and appears in Charlie Brown's All-Stars.