That naked family I cant even remember there names in Family Guy. They seemed like they were going to be part of the supporting cast and then they just dissapered. So far since the renewal there the only characters that dotn show up or get a cameo or even a mention as to why there gone. My guess is Herbert got to the boy and the family probraly had to move. That or Stewie killed them. Knowing Family Guy it was a horrible fate.
Pip, Timmy, Tweek, Towlie, Dr. Mephisto and that creepy thing that was always around him. I haven't seen any of these characters in a while not even in cameos. Oddly enough they used to be pretty popular Hell Timmy took Kenny's spot in the opening credits at one point.
Eustace and Randy on King of the Hill. They used to be Hank and Bobby's opposits these two really geeky liberals guess that got tired of the south. The liberal social worker who I guess you can say was KotH villain always making life hard for hank. He left for good I guess back to LA after Luanne's wedding.