Yacker's basic shape is that of a sphere with three tentacles, two of which are used as arms. He has one pink eye in the center of his head, and two very alien-like antennae on top of his head. Yacker's most distinguishing feature that sets him apart from the other White Wisps however, is a strand of curly blue "hair" on his head between his antennae.
During one of their past adventures, Sonic and Tails met and befriended Yacker, who they initially struggled to understand until his and the Wisps' language was translated by the Miles Electric. Through this, Sonic and Tails were informed that the other Wisps had been captured by Dr. Eggman, who intended to use their power for another diabolical scheme, which was soon foiled by Sonic and Tails.
Powers and abilities
Yacker is able to levitate in midair at will, which serves as his main method of transportation.
Being a Wisp, Yacker is able to generate and store his own unique variant of a powerful energy inside his own body, which he can pass on a fraction of by phasing into the recipient.