Xander is the first born child of King Garon and the son of his first wife Queen Katarina, making him the Crown Prince of Nohr. His mother passed away at a young age, leaving him to watch as numerous of Garon's concubines attempt to curry favor with him by siring children with him. The result with numerous half-siblings, though after much in-fighting between them, often leading to assassinations of both the concubines and their children, by his young adult life, Xander was left with three younger half-siblings Camilla, Leo, and Elise. Most of the in-fighting ended when Garon formally married Arete, gaining an adoptive younger sibling Azura. However, after a ploy by Garon, which resulted in the death of Sumeragi, King of Hoshido, Nohr kidnapped and adopted a young Corrin, though this resulted in Azura being kidnapped in retaliation. Although kept in the dark until much later in his life, Xander grew fond of his new adoptive sibling, serving as one of Corrin's combat instructors.

The first impression of Xander was a physically weak and introverted boy, leaving concern if he would be suited to inherit the throne. He was criticized by courtiers for being "unbecoming" for a Crown Prince because he was too withdrawn, an image he attempted to fix by adopting a serious demeanor. Additionally, he reveals to his son that whenever he was overly pressured in making a public speech. A paragon of patriotism and fealty to Nohr, Xander acts as expected of his title as Crown Prince. He is a valiant warrior and the first one to charge into battle for the sake of glory for Nohr. Any order of King Garon is completed with utmost perfection, even when he does not wholeheartedly agree with the intentions or the immediate results. For the sake of his people, and most importantly his father, he believes that the ends will justify the means. While a harsh judge of character, he proves to ultimately be a shrewd leader who can see the best in people, even in the likes of his own retainer Peri for example, that other people may show pause or concern. This does not mean that he is completely accepting as he has his own opinions of certain nefarious individuals, even ones allied with his father, like Hans and Iago.

While his priorities are set on bolstering Nohr's interests, Xander is at his core a family-man. Despite the dark history of the Nohrian royal family, especially in wake of his mother's death and the ensuing power struggle between Garon's concubines, Xander shows true affection and care for his younger half-siblings. He frequently makes time at home whenever not out in battle or missions to spend time with his siblings, showing a surprising amount of knowledge of their preferences, hobbies, and habits. He has ash blond hair and red eyes. He wears purple armor.