Lucifer, he's God most perfect, most beautiful angel that he had created but, he disobey God. His disobedience make him fall from heaven and the man that was once known as an angel has become a fallen angel, a demon. This lead him of wanting to seek revenge as hated growth inside his heart. Lucifer was once kind and thoughtful but after he was being thrown off heaven, he's no longer the same as he have become a heartless demon with no emotion just hated and revenge for god.