Romeo Candore Van de Montague is the son of Lord Laertes Montague and Lady Portia. He is heir to the throne of Neo Verona. For political reasons, he has been forced into an unwanted engagement with Hermione, a young noblewoman. As a nobleman, he rides and owns a ryūba named Cielo whom he later freed. In contrast to his father, he is obedient and kindhearted, often disapproving of his family's method of ruling with tyranny. He is ostracized by the nobility save for his friend, Benvolio.
Like Juliet, he too is torn between his responsibilities to his father and his love for Juliet to a lesser degree. Though he meets her in her other persona at different times, he fell in love with Juliet after two meetings: once at the Montague Rose Ball and another in a field of irises. Confused by her attempts to distance herself from him, he reexamines the graves where he first met Juliet as Odin and consults with his mother, Portia, learning that Juliet is the last daughter of the Capulets. Regardless of her heritage, he still loves her. Thanks to the aid given by Portia, and they attempt to live their lives in peace for a brief time and, similar to the play, recites marriage vows with Juliet in secret, granting her childhood dreams to be a beautiful bride. They're ultimately captured when while protecting a small town raided by the Carabinieri. Before she escapes, he swears to her that he will work for a world where everyone -noblemen and common folk alike- can live together in peace.
Banished to the Grandia mines for helping Juliet's reunion with her allies, Romeo truly learns the hardships of poverty and their spite for the Montague name when he volunteered to serve as a miner. When the mines experience a serious cave in, he orders the mines to be abandoned and the prisoners free to return to Neo Verona. When refused permission to return to Neo Verona, he leads everyone from the mines to ruins of a deserted town, and promises they could bring their families to live with them once the time was right. Near the end of the series, he had gained their respect and solidified a prosperous and plentiful village nearly from scratch.
He hears of the chaos ensuing in Neo Verona and returns to try to reason with his father. Cast aside by both his father and Mercutio, he decides only then to take arms. He rushes into the throne room after Tybalt and charges to Montague, no longer referring to him as "Father" and instead as "Duke". After his father's death, Romeo forsakes the title of Duke and announces Juliet as the new Duchess, intending to return to the village and to protect their promise together. While paying his last respects to his father, he is confronted by Tybalt who then reveals to him their relationship as brothers and Juliet's fate to Escalus. He rushes to Juliet's side and stops her, but Ophelia steals Juliet and forcefully begins to sacrifice her. With the help of Francisco, Curio, and Tybalt, Romeo successfully ends Ophelia's ritual and reawakens Juliet, though he is fatally stabbed by Ophelia. He and Juliet share one last moment together before Romeo dies in her arms. In the credits, their spirits are seen together.