Grea is a character from the manga series Ragna Crimson, appearing as a young girl with blonde hair that falls to her chest and purple eyes, giving her the apparent age of a child. She is the twin sister of another character named Hazella, and the two are often identified together as the twin commanders or a pair of sisters.

Grea and her sister share a tragic backstory. As children, they were kept as performers in a sideshow or circus, an experience that inflicted significant childhood trauma upon them. This difficult past resulted in both sisters developing twisted personalities and a fundamental emotional detachment. As a consequence, Grea, along with her twin, is revealed to have dragon blood flowing in her veins, though the specific nature or origin of this trait is not detailed in the information.

Within the story, Grea serves as a member of the Argentum Corps, the military force led by the princess Starlia. Her primary role is as a gun-toting soldier, and during a major war arc, she also takes on the function of an aerial reconnaissance scout, using her abilities to gather intelligence for her unit. Her notable abilities are tied to her nature; besides her proficiency with firearms, her dragon heritage grants her enhanced senses, including night vision, which allows her to survey battlefields.

Grea’s most defining moment and contribution to the narrative is her death during the conflict. In the middle of a counterattack against a powerful mature dragon, Grea dies just before a planned magical transposition with her sister. This event is the central turning point for her twin, Hazella, as Grea's death causes Hazella to lose nearly all of her emotions, driving her sister's subsequent actions for a significant portion of the story. Therefore, Grea’s primary function in the plot is as a catalyst for her sister’s character development, with her own brief existence defined by her shared tragic childhood and her role as a soldier fighting against the dragon monarchs.