Carbon Kirby comes from a time portal from Kirby squeak squad. He assists AM & SS Kirby in defeating the villains.
In the end of time exploiters, Carbon Kirby decides to stay with the kirbys from Kirby Air Ride instead of going back to his own time.
Carbon Kirby is the first Kirby revealed during the Kirby boom to not be evil or annoying.
Carbon Kirby's artwork is used as artwork for the GKAR Carbon Kirby. Obivously, these two are different characters.