Happer was a Mos Eisley police guard on Tatooine during the Galactic Civil War.
He was on duty when the Tonnika sisters were being detained at his facility's jail cells before being called away to an incident in Docking Bay 94 to back up the Imperial presence there.
In 1 ABY, he was tasked to investigate the murder of the lab assistant Bera Jeza.
In his rush to leave, Happer mistakenly told Riij Winward that there's trouble "brewing over at Docking Bay 97".
Happer appeared as a non-player character (NPC) in the 2003 video game Star Wars Galaxies, a massively multiplayer online roleplaying game developed by Sony Online Entertainment and published by LucasArts, prior to its closure on December 15, 2011. Happer was added to the game with the "Game Update 13," released on September 30, 2009. This NPC was part of the questline "Something is Obviously Wrong," an introduction to the "Death Troopers" update.