Nathaniel Carello is 23 years old, with blonde hair and golden eyes. Due to growing up in a toxic family environment, Nathaniel developed a "bipolar" nature, becoming quarrelsome and aggressive both in words and actions. However, he eventually fell in love with the sweet and gentle Karina, who was always by his side, helping and supporting him, and soon they started a serious relationship. He has a twin sister, Ambre, and gets along well with her.