Crown Prince of Nohr and voiced by David Stanbra

As the direct successor to the throne of Nohr, Xander was raised to wear the crown. As such, he expresses complete patriotism to his country, cutting down all who stand in the way of Nohr's prosperity and well-being. Any order of King Garon given to him is completed with utmost perfection, even when Xander may not completely agree with its intentions, believing that all are done for the sake of bringing glory to Nohr. He does not tolerate any traitors from Nohr, and is willing to kill them, including the Avatar, and his half-sister Camilla in the Revelation Route. This devotion of Xander's is double-layered, however; beneath his apparent belief that Garon's involvement in the war is for the sake of Nohr's future, he also holds a stalwart belief that the king will revert to being the loving father he once was once the war ends in his favor. So strong is this belief of his, Xander has thus proven to be obstinate and intractable in having his opinion swayed, insisting that solid evidence must be presented to prove that Garon's change is permanent.

This naive belief of Xander's in turn suggests at a tender side that he is defined by, especially one that is displayed to both his siblings and his own sons. Despite appearing too busy to get to know his siblings well, he shows Camilla how much he knows about his four siblings in their support together including a surprising wealth of small tidbits of their habits. His love for his siblings often provides the catalyst to disobey his father's orders, such as sending the Avatar help on their mission in Conquest to quell the Ice Tribe rebellion despite the fact that Garon had ordered them to complete it alone. However, at other times his sense of duty may overrule his own familial sentiments, as he tearfully continued his duel with the Avatar in Birthright even though he had just accidentally killed Elise moments before. Despite knowing that the Avatar is not his true sibling, he nevertheless has always seen them as such, usually and affectionately calling them "Little Prince/Princess." This tender side is usually kept under tight wraps, as Xander considers open displays of affection to be unbecoming of his position as the crown prince, as shown in Felicia's supports, where Xander himself comments on how his title and responsibilities have come to define him so much that even when in private he cannot shed the mantle, while Nyx's highlights that he put loyalty to his kingdom over his personal feelings for so long that doing so is reflexive at this point.

Like his younger half-siblings Camilla and Leo, Xander does care very much for his step-sister, Azura and wanted to spend more time with her. In his support for Azura, he offered her attend meeting with him regularly even though he is aware of Azura's mistreatment by the Nohrians and having dinner to be served. In Warriors support, Xander always think Azura as a younger sister. He always talk sincerely to her and felt like he lost his own family member when Azura was kidnapped by the Hoshidans.

Xander dislikes and distrusts his father's retainers Iago, Hans and Zola for their actions as much as his younger half-siblings does. He arrested Hans and sentenced him to prison until Garon liberated him for his own "good". Despite it, Xander still remained suspicious on Hans. He also threatens to kill Iago if he and Hans didn't stop killing the surrendered Hoshidan soldiers, before being cut off by Garon. When Iago attempts to kill the Avatar for sparing Hinoka, Xander steps in and, along with the Nohrian royals, vows to kill Iago and be rid of him for his cruel, disgraceful, and cowardly ways, and shows no hesitation when Leo executes Iago.

Xander has also been depicted multiple times in supports as a humble person who delights in bringing happiness to others without inviting any attention to himself. This fact extends to situations when it is blatantly obvious that he is responsible for the happiness experienced by others, where he will take the pains to stage arguments in order to conceal his involvement. In this regard, he is known to have gone so far as to outright deny claims that he has provided aid to others.

In spite of the fact that Xander has been vastly portrayed as a battle-worn individual whose skill with the blade is seemingly unrivaled, his supports with Nyx reveal that contrary to that portrayal, he detests killing and feels immense guilt for having killed so many people, even harboring suicidal thoughts as a result of his actions, leading him to believe justice is an illusion not worth chasing in this world.

As a result, while he has some sense of honor, and believes in a concept of right and wrong, Xander does not seem to think there is any such thing as a truly evil person; just evil acts and whether or not the person is forgivable. This is something reflected in how he trusts Peri with his life just because he has seen her good side, despite her violent mental instability, but is disgusted by Zola's actions in Chapter 18 of Conquest, where he refuses to win the war by killing the Hoshidan royals while they are unarmed.

The bond of trust between Xander and his retainers is one that evidently transcends the classic master-servant relationship, where he instead regards them as dear companions. This fact is best evidenced through Chapter 26 on the Birthright route, where he becomes fraught with worry and agitation when his retainers outright disobey his orders to save themselves from needless sacrifice.

As a parallel to Camilla’s role of being a mother figure, Xander is often depicted, albeit more subtly, as a fatherly figure in his interactions with others, even those beyond the realm of his family. His support interactions with others often portray him as a mature, dependable figure with extensive life experiences, and is eager to help others about their issues. For notable examples, as seen in his support with Sakura, he cites his experience of being a shy, introverted child who has trouble socializing with others as the source of his empathy for her, and displays willingness to be her practice partner in speaking so as to help Sakura overcome her social anxiety. Furthermore, his dynamic with Takumi in their mutual support (available in Fire Emblem Warriors) is presented in a similar fashion; in which he approaches a restlessly training Takumi and expresses genuine concern over the younger prince’s health, telling him that his strict training regimen is detrimental to his personal growth in the long run. In an attempt to urge Takumi to drop this habit, Xander informs Takumi that he, too, used to be a stubborn teenager who trained excessively with little concern of his own being. However, he then realized his training regimen was in fact useless, as it resulted in him being bed-ridden as much as the time he spent for actual training. When it is clear Takumi is not ready to accept new changes to his training method, Xander then elects himself to be Takumi’s training supervisor so that he doesn’t commit the same mistakes as Xander’s younger self did.

Although an accomplished military figure, and possessing a certain degree of self-respect, he is often shown to be deeply unsatisfied about his ability. As a result, he comes across as an overachieving perfectionist, notably from his support with Marth where it is revealed he heavily monitors and keeps a record of his combat performance after every battle in order to improve himself. This tendency is not exclusive to war-related matters, as even in non-serious situations such as cooking (in the My Castle game mechanics), he still displays a strong desire to carry out his tasks as best as he can, and will wholeheartedly commit to them throughout the entire process. In addition, his support with Takumi suggests that this character trait of his existed as far as since he was young; in his younger days, he was extremely dedicated in his training to the point where he would fall ill.

This never-ending obsession to improve himself is an effect of not being a natural talent, a fact alluded to in his support conversation with Sakura, and admitted by himself in his support with Frederick. He reveals that due to not born gifted, he had always been extremely diligent and serious in learning things or training so as to make himself competent. Furthermore, despite respecting Marth’s opinion that he is indeed already very skilled and absolutely needs no further improvement, he disagrees and still firmly believes that he is not good enough.

Xander is said to have the best handwriting out of everyone in the army. His birthday is October 27.