Ellis Arrison was a male Human officer in the military. He made his home on Tatooine during the era of the Galactic Civil War. By the time the Battle of Yavin occurred, Ellis Arrison, along with his brother Purvis, was living in Mos Eisley.
In the year 1 ABY, Ellis Arrison took on the responsibility of mentoring a young cadet. This cadet had begun their officer training under Antom Moria at Tansarii Point Station. To provide practical experience in leading troops, Ellis instructed his trainee to launch an assault on the Krayt Cult Cave situated near Mos Eisley. The mission was to eliminate a number of Krayt Cultists. After the cadet's successful return from this task, Arrison dispatched him to Naboo to continue his training with Sergeant Eom Nia.
Ellis Arrison appeared as a non-player character within the 2003 video game Star Wars Galaxies. This game was a massively multiplayer online roleplaying game. It was created by Sony Online Entertainment and distributed by LucasArts. The game was shut down on December 15, 2011. Ellis Arrison was implemented into the game with the release of "Publish 25," also known as the "New Game Enhancements," on November 15, 2005.