Francis Scott Key Fitzgerald is a wealthy American businessman who initially leads the Guild. After its dissolution, he forms the Renewed Guild and heads Manhasset Security. His appearance features short blonde hair, blue eyes, and tailored suits, often in creamy yellow or brown. Distinctive green tattoo-like markings manifest across his body when his ability activates. His personality blends arrogance with fierce determination. He frequently boasts of his wealth and fumes when deals are refused. Yet, he demonstrates genuine care for his subordinates' safety and profound devotion to his family. His wife, Zelda, fell ill after their daughter's death, clinging to the delusion that their daughter studies abroad. This tragedy fuels his driving goal: acquiring a supernatural Book capable of rewriting reality to resurrect his daughter and restore his family. Fitzgerald's ability, *The Great Fitzgerald*, proportionally enhances his physical strength, speed, and durability based on the monetary value he expends, whether by writing checks or utilizing any form of wealth. The power scales directly with the amount spent, enabling temporary surges of immense capability. He also possesses moderate hand-to-hand combat skills. He rose from poverty, working for two years to buy a gun, then killing four people for his initial capital. He built a vast empire encompassing three conglomerates, five hotels, an airline, and a railway company. His criminal methods and business acumen echo Jay Gatsby from his namesake's novel, sharing arrogance, illegal wealth accumulation, and the verbal mannerism "old sport." During the Guild arc, Fitzgerald places a seven-billion-yen bounty on Atsushi Nakajima, believing Atsushi's ability connects to the Book. He attacks Yokohama using the Guild's airship, *Moby Dick*, disregarding collateral damage. Aboard the ship, Atsushi and Ryūnosuke Akutagawa deplete his fortune to defeat him. Fitzgerald survives the plunge by using his wedding ring's residual value to bolster his durability, landing in the ocean. Washed ashore destitute, he is located by Louisa May Alcott. They establish a new base, Wonderful Manor. To rebuild his finances, he enlists engineer T.J. Eckleberg and exploits Eckleberg's *Eyes of God* surveillance system to manipulate stock markets, regaining wealth. This forms the Renewed Guild and Manhasset Security. In later conflicts, Fitzgerald allies with the Armed Detective Agency during the Decay of the Angel crisis, aiding them to clear their names after being framed for terrorism. He declares his allegiance shifts to the "winning side," reflecting a pragmatic evolution from his earlier philosophy that "power must be used for loftier goals" rather than saving the weak. He now prioritizes protecting subordinates, stating he "owns" them and thus has "the right to protect them."