Cain Ai

Cain Ai (ケーン アイ, Keen Ai), also known as Weakling (ウィアクリング, Wiakuringu) is a High School Student of Pearson High School by day and a member of an legal Assassination Guild: Black Beard which disposes of dangerous criminals. Cursed with cold intolerance, Cain was cursed from birth.

Appearance
Cain is a short thirteen-year-old boy with bluish-black hair and rich, deep blue eyes. As described by Niore Withers, his father, Ciel has a "wonderfully proportioned body." His arms and legs are thin, his shoulders slim and his waist narrow. Cain typically dresses in a way that suits his noble standing, and he has a very extensive wardrobe. Cain always wears a black eye-patch made of gauze with a single cord over his right eye to hide the location of his scar inflicted by his elder siblings at birth. However, while in disguise, he wears a white patch that resembles a transdermal patch, which fastens over his ear with two cords. Cain also has a some-what transparent mark on the left side of his body, that takes the shape of a dragon representing his standing in his High School. Cain sports two rings: one, which he wears on his left thumb, is an ornate silver piece that holds an emerald-cut deep blue sapphire. It is a one-of-a-kind family heirloom that had been passed down for generations. The other is a gold signet ring in the form of the Dragon mark he has located on his left side. Cain wears this on his right hand and uses it to stamp the wax seal on documents. Upon his return, the seal was given to him by his father, who told him that it was the only ring that had not been destroyed in the fire that placed his other siblings into a coma.