Braya Mattingly is a member of the Sage Council, a governing body that plays a significant behind-the-scenes role in the conflicts of Eureka Seven. In the television series, his position as one of the three sages places him in a circle of authority that observes and comments on the actions of key figures like Dewey Novak and the military. He is depicted as an adult male with brown eyes and black hair that reaches his neck. During a meeting of the Sage Council, Braya comments on the appearance of Antibody Coralians, interpreting it as a sign that the land is truly about to awaken. He also suggests that Dewey Novak's foolish actions have brought about misfortune and that the time has come to restrain him.

In the film version of Eureka Seven, Braya Mattingly holds the position of Prime Minister of the Central People's Government and is identified as the ex-husband of Coda Lovell, who is also a member of the council. This alternate continuity gives him a more directly political role compared to the television series.

Information regarding his personal background, internal motivations, significant character development, or any unique combat abilities is not detailed in the source material. His role is primarily defined by his status as an authority figure within the world's power structure, where he serves as a commentator and potential check on the actions of other major characters. His key relationships are with his fellow sages, Kuzemi and Coda, with whom he discusses the state of the world and the actions of Dewey Novak.