Emero is a young Farmagia raised with Ten, Leii, Arche, Chica, and Anzar at Dentro's orphanage in Centvelt. Like his peers, he originated as an Advanced Replicant engineered by Diluculum to cultivate powerful beings capable of joining or eliminating the Oración Seis generals.

He possesses sharp features and spiky blonde hair, marked by a distinctive dark, flame-like tattoo centered on his forehead. Emero typically wears a sleeveless dark combat tunic, a high blue scarf, black elbow-length gloves, a white apron-like waist cloth, and black-and-white boots. He shares a particularly close, sibling-like bond with Chica.

Before the main events, Emero lived on Perfectus under General Manas, befriending soldiers Gȃteau and Zucchero. Manas subjected him to experiments aimed at transforming him into the ultimate life form, the Farmagia Hyperion; Emero remained unaware of Manas's full motives. When Ten's group arrived, Emero discovered Manas's atrocities, including transforming citizens into mindless demi-beasts. Witnessing Manas's disregard for life and the tragic fate of his friends, Emero defected to join Avrion's rebellion.

In combat, Emero demonstrates proficiency with Unite Blitz techniques, combining multiple monsters into stronger forms. The anime depicts him mastering this ability earlier in childhood than his peers, though his skill development occurred later than in the game's backstory. He utilizes Lacrima crystals embedded in his weapons to summon monsters.

During the final conflict, Emero fought against Diluculum after the Magus absorbed the souls of Felicidad via the Grand Harvest Festival. Following Diluculum's defeat, Emero and his companions—collectively known as the Dragons of Centvelt—assumed leadership of Felicidad's continents, restoring peace and prosperity.