In-game, he serves as the narrator for the Records of Time chapter and is the writer behind Antonio's Notebook fragments Bayonetta (the player) encounters throughout the game.
In Bayonetta, Antonio's real features are never seen. He is only physically portrayed in his diving gear having been the one to discover Bayonetta's resting place at the bottom of a lake.
In Bayonetta: Bloody Fate, Antonio's appearance is of a middle-aged man with messy shoulder-length hair. He wears a brown hat and sports a jacket similar to Luka's own in the game complete with black gloves. The jacket has a scrap of blue cloth tied around the left sleeve with a knot and he also wears a beige shirt with a pair of dog tags around his neck on a chain. Antonio's appearance greatly compares to Luka's new look in Bayonetta 2.
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Antonio's Notebook, with the picture of a very young Luka
In Devil May Cry, "Tony Redgrave" is an alias used by Dante in his early days of demon slaying. The name can also be seen on Dante's notorious handguns, Ebony and Ivory: "For Tony Redgrave. By .45 Art Warks". When asked about the connection over twitter, Kamiya answered that Antonio Redgrave was a journalist that Dante respected, so he used it as his fake name during his days as a mercenary in Bobby's Cellar.
Antonio's voice actor in Bloody Fate is Yasushi Miyabayashi.