Fernando Diaz is a development character which was later changed to Ricardo Diaz. This development character is subject to few obscure facts in Grand Theft Auto: Vice City.
The concept art on Rockstar North's website suggests that the development name for Ricardo Diaz was in fact "Fernando Diaz". Tony Montana, from the 1983 film Scarface, may also be an influence of Ricardo Diaz' character. The name Ricardo may be a reference to Ricardo Tubs, a character from the television series Miami Vice. Diaz' mansion is similar to Montana's, whilst Diaz wears the exact same clothes as Montana during the famous chainsaw torture scene from Scarface. However, both these resemblances are mere guesses and none of the facts were officially announced by Rockstar and this character is subject to several myths that included a large change in the storyline that could've affected the Vice City Mafia and if the Fernando was based on Tony Montana then his demise might've not took place in such an easy manner.