Read more about Helen (Claymore) at: Wikipedia

Official Site: Funimation

The Claymore anime and manga series features a diverse cast of characters created by Norihiro Yagi. The series is set in a medieval world where humans coexist with creatures called yoma, sentient monsters that feed on human innards. A highly secretive group, referred to as the Organization, has created an order of half-human, half-yoma warriors to protect humans from the yoma, for a large fee. The general population refer to these warriors as Claymores, based on their gargantuan, unsheathed swords, or "Silver Eyed Witches", based on their appearances and seemingly cold nature toward others, especially humans.

Claymores' ranks are based on their strength and ability in comparison to other Claymores. They may secure higher ranks as they become stronger, but when they are surpassed by other Claymores, they will be demoted to a lower rank. Claymores are known to belong in different generations, marking the time they joined the Organization, but not all Claymores who are active at the same time belong to the same generation. This is because Claymores never age beyond their physical prime. Each Claymore is identified by a unique symbol imprinted on their sword and clothing. This symbol is also on the Black Card kept inside the hilts of their swords.

is the series' protagonist. When she was a child, a yoma made her part of its disguise and its toy, often torturing her. The yoma is killed by . Able to sense and empathizing with Teresa's own personal pain, Clare follows her for days without rest, food, or water. Teresa, after at first trying to get rid of Clare, eventually lets her travel with her, and the two became attached. The presence of a caring human in her life helps Teresa regain her lost happiness and humanity. Their life together is cut short when Teresa kills some human bandits to save Clare's life. The organization sends four of their best Claymores to execute Teresa, who is eventually killed by the awakened .

Clare vows to take Priscilla's head in revenge, and searches for a member of the organization. Once she discovers one, she demands that the organization fuse her with Teresa's flesh and blood. Clare becomes the only person to volunteer to join the Claymores and the first hybrid with 1/4 Yoma blood instead of the normal 1/2. Because of this low demonic ratio, she has little power and is given rank #47 — the lowest. However, Clare shares Teresa's ability of heightened Yoki sensing to the point of being able to predict an opponent's moves. It is unknown whether this is a genetic inheritance or Clare choosing to follow in her mentor's footsteps. At one point, Miria ponders whether this is a deliberately chosen tactic in order to fight Awakened Beings.

Helen (Claymore) has not been a contender in any CBUB matches.