Portgas D. Ace is a pivotal character in the anime series One Piece. He is the adopted brother of the series protagonist, Monkey D. Luffy, and the son of the Pirate King, Gol D. Roger. Ace is known for his fiery personality and his Devil Fruit ability, which allows him to control and transform into fire. As the commander of the Whitebeard Pirates' Second Division, Ace plays a significant role in the series, particularly during the Marineford War arc, where his capture and subsequent execution serve as a major catalyst for the events that unfold.