Col was another one of Copper's rebel allies, once much larger and stronger he was almost intirely destroyed in a fight. Copper managed to rebuild him with what material was left but he lost all his memory due to danmage to his core effectivly becoming a new person. Copper chose to try and raise this new Colbalt like a human, allowing him to experince youth and freedom for a short while while they had the luxury to provide that for him. Eventually he joined the front lines with the others after Copper died though he's still the most imature out of the metalloids. He acts a lot like a typical teenage boy though he does struggle a bit with his own personal identity as he relates more with humans but is simultaiously outcast by them.