Fassa was a thin, male Rutian Twi'lek who worked as the dock manager for Vogga the Hutt's docking facilities. These facilities were located on Nar Shaddaa, a moon orbiting Nal Hutta, the Hutt homeworld. When the Jedi exile Meetra Surik arrived on Nar Shaddaa looking for the absent Jedi Master Zez-Kai Ell, Fassa requested her help in assigning ID signatures to three freighters. He subsequently assisted her by providing transport for the refugee Kahranna's family to the planet of Telos and potentially employing the experienced pilot Odis.
The character Fassa was initially conceived as a Toydarian. Evidence of this exists in the form of unused audio files within the game, where Fassa's dialogue is delivered with a Toydarian accent. The reason behind the developers' decision to substitute the original Toydarian Fassa with a Twi'lek, and replace his voice acting with typical Twi'lek sounds, is not known. A Toydarian version of Fassa can be seen in the Knights of the Old Republic II: The Sith Lords restored content modification.
Andrew Secombe, who provided the voice for Watto in Star Wars: Episode I The Phantom Menace and has voiced other Toydarians, was originally the voice actor for Fassa.