Relius Clover is Carl Clover and Ada Clover's father, and Ignis Clover's husband. He is a colonel in the Engineering Department for the Novus Orbis Librarium, and works alongside Hazama as one of the main antagonists of the series.
Relius is a genius alchemist known as the "Puppeteer". At some point before the start of BlazBlue: Calamity Trigger, he disappeared without a trace.
Relius is known and feared by Tsubaki Yayoi and Makoto Nanaya. He also seems to know and dislike Jubei of the Six Heroes. Carl, his son, hates him for taking Ada and his mother away. Carl spends a majority of his travels in pursuit of Relius. During Noel Vermillion's story in BlazBlue: Continuum Shift, Relius attempted to kidnap her in order to 'examine' her, and he seems to have gotten a hold of Arakune at the end of his respective story. He did not hesitate to attack his own son when confronted by him.
His experiments include the resurrection of the Nox Nyctores named Deus Machina: Nirvana, which he harvested his daughter's body to create. He completed this project with help from Kokonoe of Sector Seven. His own puppet, the Fluctus Redactum: Ignis, was created from the body of his wife, Ignis, who is similar in appearance to Nirvana, although she has a red dress, blue, human-like eyes, a more slender head dress, a top hat instead of a bow, and hooked fingers.
Other creations of his include the artificial body of Yūki Terumi: Kazuma Kuvaru; Relius became the tutor of Kazuma and is inadvertently responsible for his fusion with Terumi to become Hazama.
He also seems to have been involved with the creation of Lambda-11 and Nu-13, as told in Lambda's storyline and the extra story "That Which is Inherited", and by extension, possibly the other Murakumo Units as well.
Relius is seen alongside Phantom and the Imperator of the NOL. He is also working with Hazama to achieve his goals, which at this point are unknown.
In the past, he worked alongside Kokonoe, under a group known as the "Sin Architects". During an experiment with Shūichirō Ayatsuki while using the first Boundary Interface Prime Field Device, they unknowingly unleashed the Black Beast that was sent back through time.
