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Official Site: Arc System Works

is a fighting video game series developed and published in Japan by Arc System Works, and later localized in North America by Aksys Games and in Europe by Zen United. An anime adaptation aired in autumn 2013.

;Notes

:Voiced by (English): Patrick Seitz Voiced by (Japanese): Tomokazu Sugita

is the main protagonist of the BlazBlue series from Calamity Trigger to Central Fiction. Also known as the Grim Reaper, he is feared by the NOL for being the most powerful individual to have ever rebelled against them since the Ikaruga Civil War. His actions, which included destroying countless numbers of their branches, have labeled him the most wanted criminal and caused him to receive the largest bounty ever in the history of the NOL. He possesses a powerful form of ars magus called the Azure Grimoire, or simply referred to as the titular BlazBlue, which is often either the secondary or primary target of those after him and his bounty. His ultimate goal is to destroy the NOL, for he blames them for destroying his family. He is 's biological brother, whose rivalry with him stems from an incident that happened when their sister was presumably killed. His right arm is mechanical because his real one was cut off by , who had taken control of Jin's mind. He was resurrected by as a dhampir, causing one of his green eyes to turn red and his once-blond hair to white. The BlazBlue he possesses is only a fragment of an imitation; the true Grimoire is actually destined to be wielded by . In Continuum Shift, Ragna is given the Idea Engine by a dying which enabled him to access the true Azure. He realizes that Saya is possessed by and decides to give up vengeance to protect his loved ones in Chrono Phantasma, and later in Central Fiction decides to protect the girl inside Amaterasu from the Entitled-people whose dreams are strong enough to remake the world. He and Jin (including his future-past counterpart Hakumen) soon learned that Noel/Mu can be used to recreate Saya, whose soul remains in her old body, possessed by Izanami. Once Noel and Mu merge, he helps Noel merge with Izanami and imprison her into her soul, recreating Saya. With the help of Jin and Trinity after Ragna separates the Susano'o armor from Terumi, Jin transports Ragna and Terumi to the Azure void where Ragna can kill him for good. Once all evils are finished, and after helping Noel merge with the Origin to free her from the Amaterasu Unit, Ragna's last act is to cast himself into the cauldron and remain outside the world, to make sure the Azure never falls into the wrong hands. As this act would erase himself from the memories of everybody in the story, he says goodbye to his beloved siblings and tells Amane that he has no regrets at all. Ragna disappears and leaves only his sword behind, which is later put to the hill where it is placed on a hill near Celica's church as a makeshift grave. Whether or not Ragna is truly unable to return to the world is unknown, as the final scene shows that his sword has been taken by somebody. He is also hinted not to be a natural-born human due to his unusual features, an idea that is confirmed in the final game when it is revealed he is the child of the fifth Prime Field Device. Ragna's weapon is called Blood-Scythe (ブラッドサイズ Buraddo Saizu), a giant sword that can extend into a scythe. His Drive, Soul Eater, enables him to absorb a portion of the damage dealt to replenish his health.

Hibiki Kohaku has not been a contender in any CBUB matches.