Irene

Irene was Claymore #2 during Teresa's timeline. She was demoted to #3 when Priscilla joined the Organisation. She was well known for her great speed weilding a sword, which earned her the title Quick Sword Irene. She achieves this through controlled awakening of her arm. Irene's demeanor is calm and intelligent.

Battle with Teresa
Irene was one of the Claymores sent to assassinate Teresa, along with Priscilla, Noel and Sophia. They quickly tracked Teresa down and engaged her in battle. However, Teresa was stronger than they expected and managed to defeat all three with very little difficulty. Determined to defeat Teresa, Priscilla awakened in the midst of battle, ignoring Irene's warnings. After Priscilla killed Teresa, she turned on her comrades. Both Noel and Sophia were killed and Irene lost her left arm. Irene survived the battle, however she left the organisation and went into seclusion, using her near-flawless control over her Yoma energy to hide in the mountains.

Time with Clare
Years after her battle with Teresa, Irene came across Clare running from #4 Ophelia. Irene attacks Ophelia and escapes with Clare. When Clare awakens Irene quickly gets to work training Clare how to use her "Quick Sword" technique. Once Clare had mastered enough of the Quick Sword to progress on her own, Irene cut off her remaining arm and gave it to Clare as a replacement for the limb Ophelia had cut off. However, soon after Clare left Irene was confronted by Rafaela, who'd been sent to execute her as a deserter. Though Irene had managed to hide her Yoma energy for years, training Clare had caused her to release her flow of energy, allowing the Organization to track her down. The defenseless Irene is then confronted by Rafaela, her death has been implied but not confirmed.