|Дата рождения||1 июня|
|Место рождения||2nd Hierarchical City of Iwatsuchi|
Relius was originally a researcher who studied the Boundary alongside Shūichirō Ayatsuki. They were at a dead end until Yūki Terumi showed up, offering them a vast amount of information that allowed their research to progress. In exchange, Terumi asked Relius to make a body for him, which he did by creating Kazuma Kuvaru. During an experiment however, they unknowingly unleashed the Black Beast and Relius was swallowed into the Cauldron.
Relius somehow survived, and was sent forward 80 years into the future, to the year 2179. In the process, he lost his memory, but gradually started to regain it over the years, stating that the feeling was as exhilarating as placing books back on shelves (a personal pastime of his). After reuniting with Terumi, he continued working with him in secret, and during the timeskip to the present day meets and marries Ignis, which in turn leads to the birth of Carl and Ada.
Widely known as the genius "Mad Puppeteer" with unparalleled skills in Alchemy.