The ReZEL Defenser b-Unit is also featured with a transformation gimmick with the help of some part replacements provided in the kit. It also comes with left and right trigger hands which allows it to hold both of its Mega Beam Launcher when deployed.

Both Londo Bell and Earth Federation marking specifications are also included in the kit.

The RGZ-95C ReZEL [Defenser b-Unit] is a variation of the RGZ-95 ReZEL first shown in Mobile Suit Gundam Unicorn - Bande Dessinee.

 The Defenser backpack is an assault backpack designed especially for the ReZEL that may be used in space to launch swift and decisive attacks on the enemy's stronghold or the front lines. The Defenser backpack is typically installed on the ReZEL Commander Type due to the high level of expertise required to utilize it successfully, though there have been instances of regular ReZELs using them as well. 'a-Unit' and 'b-Unit' are the two variants of the Defenser backpack.