Corsac Albain is a member of the White Fang.
Fennec Albain was Corsac's brother. They were always seen together. In "A Perfect Storm", it is shown that they work together very well and they combined their attacks in perfect sync in battle. Fennec mourns his brother's death by trying to attack Blake Belladonna and her family, as well as Sun Wukong, but is knocked out by Ilia Amitola.
Adam is Corsac's superior. Along with his brother, he seems to agree with Adam's motive and is willing to tell him about Blake's location. In "Necessary Sacrifice", he decides to follow his plans despite Adam's current behavior.
Corsac was Ilia's superior. He is aware of Ilia's previous friendship with Blake and wants to manipulate her into assassinating Blake's parents and bring Blake to Adam as it is necessary to their mission. Ilia betrayed him by knocking him out in "True Colors".
Corsac appears to respect him even after he stepped down as the High leader of the White Fang. However, after receiving orders from Adam, he along with his brother, have no problem following orders to assassinate Ghira. In "Alone Together", he and Fennec are willing to fight him without hesitation.