Kacey: Nutcase, Nutball.
Kiri: Ree-ree
Lily: Princess Lilishka
Katie: Katiebelle
Bob: Robert (yeah, I know it should be the other way around)
Hagrid: Big Fella, Big Handsome
Cricket: Cricks
Angel: Angelus (when he's a bad boy--fans of the TV show will understand )
Oz: Ozzieboy
Gatsby: Gatz

Everybody at one time or another is Catface or Kitter-Katter.