Mecha Rogue 04

Mecha Rogue 04 is a type of Mecha Rogue. It is an unknown program that suddenly appeared in the Doom Server.

Design
Mecha Rogue 04 looks like a skeletal human robot. It can fly around its opponent while slashing its claws, fire a short burst cannon from point blank range, or shoot a twin laser.

During the fight against Mecha Rogue X, it summons three Mecha Rogue 04 to fight alongside it. During the fight, if they walk into the nearby portal, they turn into recolored versions of Mecha Rogue X.

Digimon World 4
The Mecha Rogue 04 fought in the fortress was Leomon.

During the battle against Mecha Rogue Xs first form, it spawns three Mecha Rogue 04 to fight alongside it. If any of the Mecha Rogue 04 walk into the nearby portal they turn into recolored versions of Mecha Rogue X. If all three of them are defeated, Mecha Rogue X spawns more 04 - restarting the process. It will only spawn more if all three are killed, so if at least one of them remains alive it will not spawn replacements. If Mecha Rogue X is defeated whilst any of these minions remain alive it will revive itself with full HP. As such, Mecha Rogue X needs to be defeated just after its minions die, giving only a small time frame to defeat it before moving onto the fight with Mecha Rogue X's second form.