Medusa is a computer program that appears as a snake-like animal in the anime Shangri-La. It was built by the financial institution Ishida Finance to locate debts around the world by cross-referencing countries where carbon dioxide emissions and carbon credits are out of balance. Using those discovered debts, Medusa generates enormous profits for Ishida Finance through strategic manipulation of the carbon market, which functions similarly to a stock market. At the start of the story, Medusa is believed to be the only program capable of such carbon credit manipulation, though it later becomes evident that other similar programs exist elsewhere in the world. Medusa is physically hidden on the Marshall Islands, where it is shielded by a typhoon created by a weather satellite, making it difficult to reach or destroy. As an artificial intelligence designed for a specific economic function, Medusa does not display a conventional personality in the way a human character does; its behavior is driven by its programming to seek out financial opportunities and maximize returns. Its motivations are therefore purely operational—it executes the commands of Ishida Finance and serves the organization’s goals of accumulating wealth and influence within the global carbon trading system. In terms of role, Medusa functions as a critical asset for Ishida Finance, enabling the company to dominate the carbon market and exert control over national economies. It is not a central character in the sense of having personal relationships, but it is closely tied to the Ishida Finance faction, and its existence becomes a target for characters who oppose that faction’s power. Medusa does not undergo character development in the way a living being would; its nature as a static program means it remains consistent throughout the series, though its significance shifts as other parties learn of its existence and attempt to counter its influence. Notable abilities include its capacity to scan global carbon data in real time, identify discrepancies between emissions and credits in different nations, and execute high-frequency trades and market manipulations that generate vast sums of money. Its location being protected by a weather satellite also acts as a defensive mechanism, preventing easy access by outsiders. Overall, Medusa is a powerful economic weapon in a world where carbon credits have replaced traditional currency, and it illustrates the central conflict of the series surrounding environmental regulation, corporate power, and technological control.