Ragna the Bloodedge is a wanted criminal with an extraordinarily large bounty on his head (well in the trillions) for attempting to destroy the NOL, and is Jin and Saya's older brother. He is a playable character in Calamity Trigger and Continuum Shift and is the main protagonist of the series.
When he was young, Ragna lived in a church with his younger siblings Jin and Saya, and was watched over by the sister of one of the Six Heroes. At some point, Saya became very ill and Ragna decided to look after her, and in turn spending less time with his brother. Jin eventually grew jealous of Saya for being able to spend a lot of time with Ragna, and he began to hate her.
Soon after Saya became sick, the church was burnt down by Jin and Terumi Yuuki, who also cut off Ragna's right arm and kidnapped Saya. At some point, Ragna was bitten by a vampire, which turned his right eye red (causing him to become heterochromic) and turned his previously blonde-hair into white. He was later found by Jubei of the Six Heroes where he proceeded to train Ragna on how to control the power of his newly acquired Azure Grimoire which replaced his lost arm and repeatedly stated that although the item was a part of him now, the power was not his to command yet. For the next few years, Jubei trained Ragna to control the power of the Azure, being periodically watched by Rachel, who requested Jubei to take care of him. During the time, he met Taokaka as a child. When his training was at last complete, Ragna had finally come to the decision to depart on his journey.
But before the three would part ways, Jubei took Ragna to the burnt down church and handed Ragna two items once belonging to a hero named 'Bloodedge': his jacket and the Blood-Scythe. Feeling the weight of the man that gave hope to the world and the Six Heroes, Ragna finally takes off, his training now complete.