Baron Jullian Danglars is a central figure in the futuristic retelling of The Count of Monte Cristo. He is introduced as the most powerful and influential banker in Paris, a self-made man who has ascended from more modest beginnings to the pinnacle of financial society. His entire identity and self-worth are built upon his wealth, status, and the power that money provides. In his youth, he served as a crewmember on the same merchant ship as a young Edmond Dantès. It was during this time that Danglars, motivated by jealousy and a desire to protect his own embezzlement of ship funds, masterminded the false conspiracy that led to Edmond's wrongful imprisonment. This act of betrayal set the stage for the Count of Monte Cristo's elaborate revenge.

Personality-wise, Danglars is defined almost entirely by an insatiable greed and a ruthless, pragmatic ambition. He pursues wealth above all else and views every relationship and social interaction through the lens of financial or political gain. This cold, calculating nature is most evident in his relationship with his daughter, Eugénie. He sees her not as a person but as a valuable asset to be leveraged, and her engagement to Albert de Morcerf is a calculated transaction designed to merge two powerful families, enhance the Danglars name, and support the political ambitions of his old friend, General Fernand de Morcerf. He is dismissive of his wife's desires and is willing to sell her prized possessions for a suitable price, demonstrating a profound lack of sentimentality. While he has maintained a long-standing friendship with Fernand, this bond is also rooted in mutual benefit and a shared past, including their joint betrayal of Edmond Dantes.

Danglars's primary role in the story is that of a primary target for the Count's vengeance. The Count exploits his most defining characteristic, his greed, to orchestrate his downfall. By appealing to Danglars's desire for limitless financial power, the Count persuades him to open an unlimited line of credit, a seemingly advantageous arrangement that is, in fact, a trap. This manipulation leads to Danglars's complete and catastrophic financial ruin. As his empire crumbles, his social standing collapses with it. The arranged marriage of his daughter falls apart, and he is eventually forced to flee Paris to escape his creditors. In his final confrontation, the Count hunts him down in the depths of space, revealing his true identity as Edmond Dantes before leaving the broken and penniless former baron adrift as a final, fitting punishment for a man who valued only material wealth.

Throughout the series, Danglars shows little to no capacity for change or redemption. He remains steadfastly self-interested until the very end. His development, if it can be called that, is purely a downward trajectory from a position of immense power to one of absolute destitution. He has no notable physical or combat abilities; his power is purely financial. His expertise lies in manipulation, financial scheming, and the cold, strategic accumulation of capital. In the end, his ruin serves as a stark narrative illustration of how avarice and betrayal ultimately consume the one who wields them, leaving nothing of value behind.