Hey, It's That Voice!: Fans of the Pokemon anime might recognize May/Ash and Misty as the voices of Narue and Kanaka, respectively (Coincidentally, May and Narue even have similar hairstyles). Also, their father is voiced by Dan Green.
Similarly-Named Works: Named explicitly after the Japanese title of a 1948 A. E. van Vogt novel, The World of Null-A, or Naru ē no Sekai. One particular idea shared between the two is an interstellar human society that exists outside of Earth, but otherwise they're nothing alike.