Isaac Dian

Issac Dian (アイザック・ディアン) forms, along with Miria Harvent, the bumbling thief couple of Baccano!, who seem to cross into everybody's story in one way or another.

Creation
Isaac identifies with real-life thief Clyde Chestnut Barrow, from the duo Bonnie and Clyde, being possibly based on him.

Profile
Isaac is an idiot thief who, along with Miria, owes his success to the insanity of his crimes (i.e. stealing items such as candy, museum entrances, mafia housefolds and later cellphones) and the garish costumes he habitually wears (see List of Isaac and Miria's Costumes), leading witnesses to assume that he is a performer of sorts rather than a thief. He is in love with his partner-in-crime, Miria. He becomes immortal in 1930, after drinking the immortality liquor.

Abilities
Isaac has an above average luck, getting out of several dangerous situations without any serious injuries (he and Miria took 71 years to notice they were immortal), he is also very charismatic and he and Miria both "sprinkle happyness without noticing".

Bumbling Thief Duo
At some point, Isaac and Miria start their carrer as robbers, stealing valueless things such as candy and even the entrance door of a museum (so people "couldn't enter there anymore"), but later the duo attemp to steal the entire housefold of the mafia families of Genoard (which they succeded) and Martillo, incident on which they become unintentionally immortal, after drinking the Cure-All Elixir.

1931 Train Incident
Isaac and Miria are seen in California unsuccessfully attempting to mine gold ("steal from the earth" as Isaac explains). It had been a year since they left New York and during their stay there, the two have become close with Ennis. Isaac and Miria decide to go back to New York but since they have no money, they plan on committing train robbery. The two, however, manage to rob some establishment (from the Genoard Family) prior to their departure, deciding to use the Flying Pussyfoot as a getaway vehicle, board of the train, they befriend Jacuzzi Splot, Nice Holystone and Czeslaw Meyer (who initially didn't trusted them). They end up gaining Czes' trust after saving him from falling from the train (not that he would die anyway).

Afterwards
He is caught in 1934, on his own, and sent to Alcatraz, but released in the same year. He and Miria notice they don't age 67 years later, in 2001, after stealing some cellphones in Manhattan.