Alexander is the central character of the single-episode historical OVA. He is depicted as the young King of Macedonia, leading his nation's military campaign against the Persian Empire during a period of intense conflict. His background is rooted in a classical education and a deep, formative friendship. From a young age, Alexander and his companion Philippus, who is of Persian origin, studied together under the renowned scholar Aristotle. This shared experience forged a strong, lifelong bond between the two, making their connection one of the most significant elements of his life.

In terms of personality, Alexander is portrayed as a leader who is both thoughtful and deeply conflicted, especially when the pressures of his crown clash with his personal loyalties. His role in the story is defined by a moment of extreme crisis. During the expedition eastward, Alexander falls gravely ill, a turn of events that places him in a vulnerable and dependent state. In his hour of need, his trusted friend Philippus offers him a personally prepared medicine. However, the situation is complicated when Alexander receives a secret letter, the contents of which suggest that Philippus is in contact with the enemy. This revelation throws the king into a profound internal turmoil.

His primary motivation is therefore the need to resolve this impossible dilemma: whether to trust his childhood friend and accept the remedy, or to treat Philippus as an enemy and refuse the potentially life-saving aid based on suspicion. The narrative centers entirely on this pivotal "Alexander's Decision," exploring the heavy burden of leadership where a ruler must weigh personal friendship against political security and the fate of his own life. His key relationships are defined by this conflict, most notably his bond with Philippus, which serves as the story's emotional core. The character development Alexander undergoes is not a gradual change but a concentrated trial; his growth is shown through the process of making this single, agonizing choice that will define his leadership and potentially alter the course of his war. Regarding notable abilities, the narrative focuses on his political and moral reasoning rather than any physical or supernatural powers, presenting him as a historical figure grappling with a question of trust and betrayal.