its just his character design, i found it interesting to tweak the notion of red foxes usually having the stockings on both arms and just have it on one... it also has something to do with his father having stockings on both arms and his mother only having one on her right side as well... it was supposed to show a stronger connection to his mother than the ideas of his father and... well it's complicated but that's the general theme ~
its just his character design, i found it interesting to tweak the notion of red foxes usually havin