So I finally finished~ I was making his outfit without thinking, so it's rather simple. He has bag and those little sacks, because Yukio is not a ninja in general. He is the courier, that knows basic ninjutsu and elements, but mostly he uses his fire element and katana to fight, when he is under attack during mission or something. Yukio usually does 'dirty' works, like false papers, or expensice and illegal things. He doesn't have any affilation, so now he just travels around.