Isaac is Dunya's knight.
During the coup on the Musta'sim royal family, Issac tries to protect Dunya, but he ends up skewered to death by the soldiers.
Isaac is created by Shinobu Ohtaka who has no information regarding any inspiration used to create him. He first appears in Magi volume 10: chapter 89 and episode 20.
He's a skilled swordsman who uses the magnetic forces in his armor, the Al-Qaus Kauza, to augment his speed during battle.