Arks, Sephiria

セフィリア＝アークス

Sephiria Arks in the manga
Number I. Her weapon is 'Christ,' an extremely sharp sabre made of Orichalcum (Orichalcon) that is incredibly strong. Despite her gentle appearance and young age, her swordsmanship allows her to attack with extreme speed and precision, producing no sound when her blade cuts. She can also move fast enough to create after-images that confuse opponents. Although young, she is very charismatic and genuinely values life. It is said that she can see through a person's soul, as she can accurately guess their feelings. Because of this ability, she often manipulates others, such as Train Heartnet. While she can be cruel and hurtful in pursuit of her ambitions, she is not a mean-spirited person. Regardless of whether someone is a friend or foe, she hates seeing anyone sacrificed—though in a battle with Creed Diskenth, she would have sacrificed her own life (via an explosive bracelet) to destroy Creed, had Train not intervened. In the final tankouban of Black Cat, she mentions that her body has enhanced recovery time because she was "born to live for Chronos" and "wouldn't die so easily". She is also a master swordsman, knowing all thirty-six moves of her style, the ultimate being 'Apocalypse,' which completely reduces a target to nothing.
Sephiria Arks in the anime
Sephiria holds much animosity towards Train for leaving Chronos and is generally more aggressive than her manga counterpart. Her appearance looks younger as well, and she seems to be near Train's age. Her manipulativeness is also toned down in the anime, and she is more forthright than sneaky. She decides to help Train fight Eden to rescue Eve when Train insults her pride. In these battles, she demonstrates her superior fighting abilities. At the end of the anime, she leaves to rebuild Chronos from scratch.