Unlike the other pirates that appear in Assassin's Creed: Black Flag who opt for a less flashy appearance, the French captain and Templar Julien Du Casse has a spectacular style that seems to match his all-over-the-place attitude and personality like a glove. His impressive red cape is the first thing that you notice, as well as his wide-brimmed hat that occasionally conceals his ice-blue eyes.
For its part, his hat is adorned with a collection of feathers, which no doubt once belonged to exotic birds.
The way that Du Casse chooses to present himself looks like it is inspired by old tales of adventuring in faraway lands. He can be seen wearing a white shirt which is unbuttoned to his waist, where it is tied around with a wide sash similar to the one that Edward is wearing with several of his outfits. Du Casse has two leather belts over his sash, and a leather strap diagonally across his chest.
The lower part of his outfit consists of loose brown breeches, obviously made of expensive fabric, with golden buttons on the sides, and fancy ankle boots.
In spite of his vibrant appearance, however, Julien Du Casse is a cruel man, whose dark and sadistic personality may not be directly exposed in the game, but it is implied, sometimes more or occasionally less directly, as the story unfolds. As early as in memory Mr Walpole, I Presume?, which marks Edward's first encounter with Du Casse, the French captain, noticing that Edward doesn't carry a hidden blade, offers him a collection of several Assassin blades to choose from. When Edward innocently asks him where he found all these, Du Casse replies with a chillinly evil grin that he took them as souvenirs. Apparently having massacred previously their original owners. And it is not random that it is he who aids Governor Torres and his trusty bodyguard El Tiburon neutralize Edward and send him off as a prisoner with the Treasure Fleet after discovering that he cheated them by impersonating Duncan Walpole. Later when Edward and Mary discover his secret hideout in the forest of the Great Inagua in memory This Old Cove, Mary wonders what this place could be hiding; to which Edward replies that, knowing Du Casse, he could have an array of medieval torture machines and instruments. Then in memory Delirium, one of the visions that Edward has while heavily drunk is that of Du Casse interrogating an assassin whom he keeps tied and, apparently, has been torturing for hours.
Du Casse's overall appearance looks like it is inspired by the pirate depicted in the painting "The Buccaneer Was a Picturesque Fellow" by Howard Pyle, which accompanied the painter's article "The Fate of A Treasure-Town" in Harper’s Monthly Magazine published in December 1905.
Ιf you exclude the shoes, the rest of the outfit is pretty similar. Contrary to other pirates of Black Flag who were real historical figures, Julien Du Casse is a fictional character, but as a hero of fiction he is related to a real-life privateer, Jean-Baptiste Du Casse; Julien is his nephew in the game, and he used to fight alongside his uncle before becoming a mercenary and a slave trader - two activities that partly explain the sadistic nature that he is hinted to have in the game.