Arcïco was a Ice-Jin. He was one of the two leaders of the Rebells, who fought King Cold. He was put in jail, framed for murdering King Cold's father.
Not many have seen Arcïco at close range, but King Cold says that Cooler looks exactly like him.
More to be revealed....
Many describe Arcïco as a cold blooded, insane killer, mostly because of him killing King Cold's father. Nowdays, people say that he laughed when he was put in jail. But actually he was saddened, but convinced that he did right. In jail, he is silent, and has a dead look, making him look even more insane.