Team Dark

Team Dark is a tactical black operations team under the direct command of the chief commander of G.U.N., Abraham Tower. The team consists of G.U.N.'s most powerful, capable and resourceful agents; namely Shadow the Hedgehog, Rouge the Bat, E-123 Omega, and Hope Kintobor who provides mechanical support but doesn't get directly involved in the missions. The team was formed under the order of Commander Tower in order to see to the success of Shadow's earlier mission of obtaining a Chaos Emerald from Feist in the Special Zone, which they accomplished.

Formation and First Mission
The team was formed shortly after Shadow and Rouge were assigned on a mission to the Special Zone to collect a Chaos Emerald where they met the Zone's master, Feist, who said they could have an emerald if they completed his challenge, taking away Shadow's Chaos Control abilities to make it more difficult. Despite their best efforts, the duo failed their first attempt to get the emerald and were teleported back to G.U.N. HQ, with Shadow blaming himself for their failure. After a violent training session with E-123 Omega and a talk with Hope Kintobor, Shadow, Rouge, and Omega returned to the Special Zone now under the name of "Team Dark", the name of which would become evident after time according to Commander Tower. Team Dark was then given a new challenge by Feist; obtain the emerald in the center of a maze in order to win it. Though they arrived at the center, Feist conjured up more emeralds and the team failed to find the real one in time. They then resorted to "Plan B" and had Omega blast Feist in the face while Rouge and Shadow swiped the emerald. Feist became enraged by this, however Shadow used the emerald to teleport all three of them back to G.U.N. HQ with Chaos Control and deliver the emerald to Commander Tower, who was delighted at the team having recovered a second emerald for G.U.N.. (SU: #4)

Methods
Due to being a merciless surgical strike team, Team Dark is willing to use any method they see necessary to complete their missions, no matter how violent. (SU: #4)

Background information

 * Team Dark was originally a team from Sonic Heroes, the game that introduced E-123 Omega, and brought Shadow the Hedgehog back into the series from his supposed death. They were the most difficult out of all four teams due to the larger amount of enemies in their levels.
 * Team Dark is the second most recurring team in the games, the first being Team Sonic which consists of Sonic, Tails, and Knuckles, the three most recurring characters in the entire series.
 * Rouge was never said to be the leader of Team Dark in the games (though it was quite obvious in Sonic Heroes) or comics, but Ian Flynn confirms that Rouge is the field leader of the team while they work under the command of Abraham Tower, GUN's chief commander. (1)
 * Although never stated in the comics, Ian Flynn says Hope Kintobor is also part of the group as part of the "greater team". (2)