Michael de Romanoff is the third prince of the Britia Empire and the younger brother of Crown Prince Linden de Romanoff. Known throughout the empire as the Sword Emperor, he is regarded as the strongest Aura Knight in the realm. He holds the military rank of Lieutenant General and serves as the captain of the Imperial Sword Knights. Despite his royal status, Michael possesses a free-spirited and adventurous nature. Those closest to him often call him by the affectionate nickname Mill.

In his past life, Michael was the only true friend of Elise de Clorance, the former empress. After Elise's execution and subsequent reincarnation, he quietly watches over her, though he maintains a blunt and sometimes harsh demeanor. He frequently directs sharp, critical words toward Elise, but this behavior masks a deep-seated care and concern for her well-being. The noble faction attempts to use Michael as a figurehead for their political schemes, yet he does not agree with their methods and remains independent in his convictions.

Michael's motivations are rooted in a desire to do what is right, even when it places him at odds with court politics. He is determined to protect those he cares about, especially Elise, and to uphold a sense of justice that transcends his noble obligations. Throughout the story, Michael develops a close bond with Elise, supporting her medical reforms and personal growth despite initial misunderstandings. His role is that of a steadfast guardian and ally, using his immense combat prowess and strategic mind to safeguard the empire and the people he values. Over time, he grapples with the weight of his responsibilities as a prince and soldier, revealing a character who is both confident and vulnerable.