Claymore ranked #1. She and her sister have a mental link with one another. Alicia is the only Awakened Claymore the orginization controls.
Not much is known about Alicia and her sister Beth, other than they are the organizations most proud creation in the Claymore line. They first appeared in Claymore volume 11 where Galatea was given a view at their strength. She asked to talk to them but the organization members said they have no will of their own. Currently she and her sister were ordered to kill Riful and followed the Abyssal Feeders. After the Abyssal Feeders started to attack Riful and Dauf Alicia and Beth revealed themselves to her and prepared to attack them.
Though a prominent character in the manga, Alicia and her sister Beth were only passingly mentioned by Miria in the anime, where she warned Clare of the symbols of the top ranked Claymore who Clare should try to avoid.
Alicia is the deadly one of the twins as she can awaken and Beth can control her.