There were two Coatls that guarded the alleged gold statue of Quetzalcoatl in Mexico. The first, of red plumage, was trapped by Ray Stantz when he utilized the SCEP-TECH, while the other was their would-be guide, Paco. In his true form, Paco is of purple plumage like his human form's poncho and hat.
Paco  is a Coatl able to assume human form. He guided Ray Stantz, Slimer, and Jim Venkman on their quest to find the treasure. During a battle, Paco accidentally trapped the trio behind a trap door. Slimer asked him to enlist the help of the other Ghostbusters. Paco agreed and called the Ghostbusters in New York. While in his Coatl form, Paco manages to avoid capture by the Ghostbusters and managed to free Ray, Slimer, and Charlie. After returning to human form when the Ghostbusters defeated Quetzalcoatl, he changed back to his true form and returned to the temple once the guys agreed to tell others not to look for the treasure anymore. It turned out that Paco's plan was to use a group of adventurers to convince the outside world to leave the treasure alone. While on the flight back to the States, Jim spreads his cover story that the temple collapsed as the expedition team escaped.
Coatls have the power of flight, pyrokinesis, and shapeshifting. Without knowing it, Egon Spengler got strong readings off of Paco, while it was in human form.
- None of the Ghostbusters knew that Paco was a Coatl.
- On page one of Ghostbusters Volume 2 Issue #10, Paco, in human form, makes a non-canon cameo in the background.
- Marsha Goodman (1991). Episode Call Sheet and SAG Report - "The Treasure of Sierra Tamale" (1991).
- Paco (2009). The Real Ghostbusters - "The Treasure of Sierra Tamale" (1991) (DVD ts. 13:26-13:28). Time Life Entertainment. Paco says: "Your friends have been captured by a Coatl."
- Egon Spengler (2009). The Real Ghostbusters - "The Treasure of Sierra Tamale" (1991) (DVD ts. 13:34-13:37). Time Life Entertainment. Egon says: "The mythical flying serpent of the Aztecs."
- Paco (2009). The Real Ghostbusters - "The Treasure of Sierra Tamale" (1991) (DVD ts. 08:09-08:12). Time Life Entertainment. Paco says: "Gran [Translation: The Great] Paco at your service, Senor Stantz."