Pons Limbic/Legends

Brainiac was the nickame given to a male Siniteen by the smuggler Bo Shek. Brainiac was present in Chalmun's Cantina when Luke and Han met for the first time. Bo Shek gave him that name because he could calculate Hyperspace jumps without any help of a Navicomputer. We was sitting at a table with Arleil Shous, Bom Vimdin, Hem Dazon and another patron (Kelnor?). Brainiac's real name is still unknown.

Behind the Scenes
Brainiac was wearing a green outfit and had yellow eyes. He can be seen in the movie in the first Cantina shot. He was also seen in the Holiday Special. It is unknown if this was the same Siniteen.

Appearance

 * A New Hope
 * The Holiday Special

Source
Decipher's Card Game