Nega-Wisp

The Nega-Wisp is a subbreed of Wisps that appear in Sonic Colors. Unlike other types of Wisps, the Nega-Wisps do not occure naturally. Rather, Nega-Wisps are created when regular Wisps are completely drained of their own Hyper-go-on, resulting them mutating into Nega-Wisps. Normal Wisps can mutate into either Purple Wisps or Violet Wisps, regardless of their original type, while Mother Wisp mutated into Nega-Mother Wisp.

Overview
During the events of Sonic Colors, thousands of Nega-Wisps were created by Doctor Eggman when the scientist sat his sights on draining the captured Wisps of their Hyper-go-on to power his Mind Control Ray, in an attempt for world domination. The Nega-Wisps created from this process were then forced to carry out Eggman's plans upon their creation. The location where Wisps were converted into Nega-Wisps was inside a factory in Asteroid Coaster, which sucked the Hyper-go-on out of them.

At the end of Sonic Colors, all of the Nega-Wisps were reverted back to normal by the unaffected Wisps with their own Hyper-go-on, with the exception of Mother Wisp, who was returned to normal by Super Sonic.

Physical Appearance
While each different in appearance, Nega-Wisps share certain characteristics that separates them from regular Wisps. During their mutation, they become dark in colors, mostly in purple and violet, they lose their eyes and gains sharp mouths, which gives them a more sinister appearance in comparison to other Wisps.

Characteristics
Unlike normal Wisps, who have playful personalities, the Nega-Wisps are rather violet, and has degraded into a more animalistic state of mind. Even with Tails's translator, the Nega-Wisps were far too mutated to be understood.

Despite their behavior, however, the Nega-Wisps are not evil by nature, and does not like Dr. Eggman like the rest of their race, despite serving him. As such, in the cases of Purple Wisps and Violet Wisps, they were more willing to side with Sonic and aid him when needed, while defying Eggman.