Yacker Wisp is a friendly alien from the Wisp species, introduced in the game 'Sonic Colors' within the Sonic the Hedgehog franchise. He acts as Sonic’s primary guide and companion throughout the adventure, helping Sonic understand the Wisps’ powers and communicate with their kind. Yacker’s key role is to assist in stopping Dr. Eggman's evil plans and freeing his fellow Wisps. His cheerful and expressive nature makes him a memorable non-human ally in Sonic's quest.