Stacker Pentecost is the brother of Luna Pentecost. He was a Marshal in the Alliance Defense Corps and oversaw operations in the Bespin Intel HQ before his death in the Unity Era by the Nationalists. Pentecost is haunted by the death of his father and sister, Luna. The llness and subsequent death of his soldier, Tamsin, leaves him burdened with the responsibility of protecting the world from the Axis and makes him responsible for Mako. Though he believes she can became as a soldier as well as anyone, his fear that her desire for revenge in the name of her family will consume her, prevents him from allowing her to pilot. Their relationship is built on mutual respect and understanding for one another. Mako is the only family he has left.