He shares many traits with Jay Gatsby, the protagonist from the actual Fitzgerald's work. Personality-wise, both are arrogant; too optimistic, and flawed; nonetheless, they are determined and hardworking in order to obtain what they desire. Background wise, it is unknown where their fortune came from, other than the commits of illegal activities. Fitzgerald and Jay are set to get what they want. Through the use of money as their power. And speech wise, as they both end some sentences by "old sport."
(From Bungostraydogs Wiki)