The Yellow Wisp is a fictional character from the Sonic the Hedgehog series, first introduced in 'Sonic Colors.' As an alien creature from the planet Wisps, the Yellow Wisp grants Sonic the ability to drill through soft ground and underwater areas, enabling access to hidden paths and secrets. It does not speak in human language, but communicates through expressive sounds. The Yellow Wisp plays a supportive role, helping Sonic on his quest to defeat Dr. Eggman and save the Wisps from captivity.