Christophe Cortes, who's full name is "Christophe Mendias Theodore Cortes", is Cortes' older brother. He refuses to call him Cortes and calls him by his first name: Aran. He arrives at Puerto Angel in a Mosquito asking a favour from Cortes to help him get his damaged ship that's stuck in ice barriers in a Sphere zone. Christophe's ship is the Callisto, a 'sister' to the Saint Nazaire. After Cortes helps Christophe free the Callisto from the icebarriers, Lena reveals him in possession of exalarium which is only useful to the Sphere in anti-Seijen containment technology. Christophe claims that he was only to going to deliver the supposedly worthless metal to maintain the Sphere's confidence. Unfortunately, when the Sphere left by Diwan assaulted both frigates and the Saint Nazaire being low on power, Christophe pretended to meet with Diwan to discuss their surrender before self-destructing the Callisto. Afterwards, he managed to escape Sphere custody with the promise to reunite with his brother soon.