Comby's body resembles a purple ornate comb with a light-blue, spherical head. She wears a lavender ruff. Her gemstone is located where her nose would be.
Trivia
While her name is not mentioned onscreen, Comby was named in the credits of "Familiar".
Comby shares the same voice actress as Blue Diamond.
It is unknown whether or not if Comby is a Gem-powered object, similiar to The MirrorLapis Lazuli was trapped in.