Japanese communities make reference to them as "dougi" characters, referring to the standard martial arts gi typically worn by shoto figures. In which Ryu has a more "electrical" affinity, Ken's personalized advancement of the type provides him an affinity to fireplace, most obvious in his significant Shoryuken between other moves. https://whiskeyeditions.com/product/hibiki-japanese-harmony-ryusui-hyakka-limited-edition-2021/