Gabriel has white eyes and hair. He's got a halo on his head, too. Dressed in some kind of white clothes from the paradise Aliexpress. As a being created to love God, he is uninterested in anything other than God's love and exaltation. He has the title Angel Killer because he loved God so much that he couldn't restrain himself when God's love was directed at another angel and killed another archangel with his own hands.