Shadowbot

Shadowbots were the primary army and workforce of Robo Robotnik upon coming to Mobius Prime when he replaced the recently deceased Dr. Ivo Robotnik (his Mobius Prime counterpart). Shadowbots were much taller and slightly more effective than the previous Robotnik's SWATbot models, though were still no match for Sonic the Hedgehog or the Freedom Fighters. Shadowbots were the main force behind Robo-Robonik's retaking of Robotropolis and securing his empire on Mobius. However, the Shadowbot model was abandoned after they were all but destroyed along with Robotropolis by Station Square's nuclear strike.

Early Models
Early versions of the Shadowbot known as Shadow SWATbots were seen when Robo Robotnik first arrive in Mobius Prime, chasing after Cyborg Sonic. These early models were outclassed by Robotnik Prime's regular SWATbot models, and Robo Robotnik was forced to retreat. (StH: #19)

Retaking Mobotropolis
Having succeeded in wiping out Sonic and the Freedom Fighters in his home reality, Robo Robotnik proceeded to visit Mobius Prime. When he discovered that Robotnik Prime had fallen in this dimension, he decided to take his place. For months, Robo Robotnik remained onboard a satellite space station, causing problems for Sonic and the Mobians below. However, when he managed to lure Sonic and the Knothole Freedom Fighters to his satellite, he sent his hordes of Shadowbots to retake the unsuspecting city. With resounding success, Mobotropolis fell to his forces, and although his satellite (along with his original robot body) was destroyed, Mobotropolis was retaken by the Shadowbots, which managed to capture numerous Mobians which were subsequently rounded up and roboticized. (StH: #75)

Military Might
When Prince Elias snuck into Robotropolis to find a cure for his ailing mother's health, Shadowbots discovered him during his attempted return back to Knothole. Shadowbots managed to captured and imprison him. When King Max lead the Acorn Kingdom Army to Robotropolis in order to rescue Elias, Shadowbots attempted to defend the city, though the might of the Acorn Kingdom's army proved too much, and Elias was successfully rescued. (StH: #88)

The Shadowbots maintained a constant presence throughout Robotropolis, particularly after a large group of Overlanders arrived from outer space and took up residence in the city. Shadowbots were made out by Eggman to be the city's protectors from Mobians, and the Overlanders believed this, particularly after they chased off a psychotic Kodos. (StH: #94)

Other Roles and Destruction
For months, the Shadowbots remained the primary military might of Robo Robotnik (not calling himself Dr. Eggman). However, when the numerous Robians in Robotropolis had their free will restored by the Sword of Acorns and were subsequently rescued from Robotropolis, the Shadowbots took on the role of labourers as well. Some of these jobs included burning oil or simple construction duties. However, the Shadowbots became all but extinct when Robotropolis was nuked by Station Square, with only a few being converted into Updated SWATbots. (StH: #100, #110, #133)

Personality
Shadowbots displayed even less personality than Robotnik Prime's SWATbots. Shadowbots typically said only one line of dialogue: "Surrender all hope and prepare to be roboticized in the name of Doctor Robotnik". On occassion however, they did show signs of personality, such as when they replied to Eggman saying "You don't have to tell us twice, Dr. Robotnik" with regards to carrying out an order. (StH: #100, #110)