Claim: Norman Gunston's 1992 "Amigos Para Siempre (Friends for Life)" was a duet with Effie, a fellow comedic character portrayed by Mary Coustas.
Evidence: 1992 "Amigos Para Siempre (Friends for Life)"
(with Effie) Efthimia Francesca Stephanidis, better known as just "Effie", is an outrageous comedic character played by Australian actress Mary Coustas.