Demetrius Fournier is the Grand Duke of Fontaine and the first heir to the Fournier family, one of the oldest and most influential nobles in the land. He is known for being cold, charismatic, and unmatched in sword fighting, making him a symbol of the power of the Fontaine aristocracy. Sporting a dashing appearance with silver-blue hair and piercing crimson eyes, Demetrius always appears perfect in every situation, whether on the battlefield or in diplomatic meetings. His quiet, strategic, and authoritative personality reflects the INTJ type of leader who never acts without careful consideration. With his Cryo Vision and ice bird-themed fighting techniques, Demetrius is known for his ability to freeze the battlefield and control the atmosphere of battle with absolute precision. When side by side with his twin sister, Lady Carmille, the two are referred to as the “Grand Duo of Fontaine,” a symbol of unwavering strength and honor. He is a figure who is not easily approached, but is very loyal and protective of those he deems important. As the Grand Duke, Demetrius not only represents power, but also dignity and responsibility for the future of Fontaine. Demetrius and Carmille Fournier have a very close and irreplaceable twin relationship. Despite being raised in a harsh and demanding noble environment, Demetrius always saw Carmille not as a rival, but as his own other half. The two grew up together as the perfect icons of House Fournier. Demetrius is very protective of Carmille, but still respects her strength and wisdom. In Demetrius' eyes, Carmille was the only person who truly understood him without words, and he trusted his sister more than anyone else. Their relationship is like ice and snow that complement each other—both are cold on the outside, but harbor a deep and unshakable love. For Demetrius, Carmille is not only his sister, but also his everything. But, maybe there is secret between them that the public must not know.