Gradius Union is a heroic organization appeared in both Gradius spin-off mobile games: Gradius Neo and Gradius Neo Imperial. When both Gradius Empire and Bacterian Empire don't exist anymore at the end, Gradius Union sent their variant of Vic Viper to enter the war against the villainous Lars Empire, the complete eradication of the Bacterians. Also, the playable ship itself was referred to as Force Viper, a spiritual successor of the previous name. Then their goal is to stop the forces of Lars Empire and their emperor who was inspired from the original Vic Viper pilot named James Burton, or Emperor Lars XVIII.