The MS-07B-3 Gouf Custom is an upgraded variant of the MS-07B Gouf that was introduced shortly after the MS-09B Dom. It first appeared in the anime Mobile Suit Gundam: The 08th MS Team.
During the deployment of the Gouf, its limited combat versatility became evident with its design concept of emphasis on hand-to-hand combat. Numerous disadvantages surfaced during operation on the battlefield, such as lack of flexibility due to the Gouf's fixed armament. The Gouf would be completely redesigned as the MS-07B-3, which was an improvement over the original.
The Gouf Custom was designed with improved close-quarters shooting and detachable weapons. It was designed primarily for ace pilots preferring a lighter mobile suit that could leap and jump as opposed to the heavy, yet effective MS-09B Dom.