Nightwing aka Dick Grayson

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The youngest in a family of acrobats known as the "Flying Graysons", Grayson witnesses a mafia boss named Tony Zucco kill his parents in order to extort money from the circus that employed them. After the tragic murder, Batman (Bruce Wayne) takes Grayson in as his legal ward and trains him to become his crime-fighting partner Robin.As well as being Batman's crime-fighting partner, Grayson establishes himself as the leader of the Teen Titans, a team of teenage superheroes. As a young man, he retires as Robin and takes on his own superhero identity to assert his independence, becoming Nightwing. As Nightwing, he continues to lead the Teen Titans, Titans, and later the Outsiders. He becomes the protector of Blüdhaven, Gotham's economically troubled neighboring city, the locale the character is most closely associated with.