Portgas D. Ace, also known as "Fire Fist Ace," is a character from the popular manga and anime series One Piece. He is the adopted brother of the main protagonist, Monkey D. Luffy, and the biological son of Gol D. Roger, the former Pirate King. Ace is known for his powerful Mera Mera no Mi (Flame-Flame Fruit) abilities, which allow him to create and control fire. Ace was a prominent member of the Whitebeard Pirates and served as the second division commander. His character is defined by his strong sense of loyalty and his desire to protect his loved ones. Ace's story is central to the themes of brotherhood and sacrifice in One Piece.