Sōma Kujō leads the Kujō Family, an organization entangled in enduring dark rumors, while simultaneously holding a board or executive position at a major pharmaceutical company. Chronic illness severely restricts his public visibility, amplifying his secretive and enigmatic persona. His duties involve handling substantial undisclosed information, underscored by his declaration: "You have the right to know. It’s my responsibility to tell you."

Physically, he is 30 years old, born on September 9, and stands 179 cm tall with light blonde hair and grey eyes. He excels at speed-reading but struggles intensely in crowded environments. Reading dominates his hobbies, and he admits a liking for sweets when asked. He labels enemies as "fools" and deems narcotics "very troublesome." For his future, he aims to live "until I by myself play as an anti-hero role," hinting at complex self-perception and internal conflict regarding his role.

His Kujō Family affiliation places him within a specific faction. Associates include Kaname Yamazaki, a young genius interacting with the family, and Koya Kirishima, a former boxer serving as a family bodyguard. The precise dynamics of Sōma Kujō’s relationships within the family lack elaboration, and his rare public appearances due to health constraints inherently limit observable interactions and narrative development.

No concrete details exist about his specific background story, character development arcs, or narrative progression across official media seasons, films, OVAs, or spin-offs. References to card stories (Normal, Rare, Super Rare, Event Stories) and potential private records or memory albums exist, but their content and plot specifics remain undescribed.