When Gargamel made Smurfette she was evil and had the dark hair but later on in the same episode Papa Smurf used his magic making her a normal smurf but it had one side effect........it made her blond. Near the end of the series several new smurfs were added to the show to add the cute factor one of them was a lil girl redhead with pigtails. But nobody seems to know the orgin story of Grand Pa, Wild, or the children smurfs.