Hidan and Kakuzu (Naruto / akatsuki)?
Hidan and Kakuzu properl have appeaared in shippuden yet?
They have appeared in the manga but not the anime. I think it will appear in the anime in an arc or so. Manga Hidan and Kakuzu first appearance: Chapter 312, page 15 http://www.onemanga.com/Naruto/312/15/ And the chapter on the current episode anime manga: Chapter 301 http://www.onemanga.com/Naruto/301/02/