So let me explain Felix Argyle or known as Ferris is from the peak isekai Re zero, Crusch Karsten's knight, a member of her camp, and a member of the Royal Guard. He plays a major supporting role in Arc 3 and a supporting role in Arc 5. Felix was born of the fallen House Argyle, and he is a longtime friend of crusch, since she saved him. demi-human traits, Ferris has shown himself to be the best healer throughout the Kingdom of Lugunica, earning himself the title of Blueand a place within the Royal Guard. Following the death of Fourier Lugunica, Ferris was anointed as Crusch's knight, and he strives to make Crusch the country's next monarch.
his parents mistreated him because they suspected an affair. He was locked in the basement of the Argyle Mansion for the first nine years of his life and was barely cared for.
was locked in the basement of the Argyle Mansion for the first nine years of his life and was barely cared for. One day, as a result of rumors that were in the Karsten Duchy, a young Crusch Karsten visited the Argyles’ household and found Felix. After slowly learning about the truth behind his circumstances, he encountered his parents and attempted to stab his mother out of hatred. However, Crusch was ultimately the target of his fury, and as she approached death and told him to live in a way that brought no shame to his soul, a blue-white light emerged from Felix and spread to the girl's body. By using healing magic for the first time in his life, Felix saved Crusch's life and, remembering her words, requested that she allow him to use his life by her side. He was subsequently taken to the Karsten Manor to be cared for and made Crusch's attendant while his parents lost what little standing they had with the Karsten family, leading to their decline.
In the following years to come, Felix would establish a strong sense of loyalty and devotion towards Crusch for taking him from the hell that was his life before. Half a year after arriving at her mansion, Felix made an oath with Crusch to act like a girl and “exchange” his boyhood to her,since she sought to succeed her father and become a duke, which she did not believe she could do as a woman. While Felix began wearing girls’ clothes, Crusch wore formal men’s suits to fulfill her oath and cease acting like a woman.