Right from the beginning, as was common at the time everywhere in the world, Japanese civilian aviators were not much obliged by official rules and therefore used whatever design fancied them to decorate their aircraft resulting in some really spectacular schemes and markings.
Most often the aircraft carried the name and/or the logo of the owner only on the fuselage or on the tail. From 1921 onwards the J- registration, always in black according to regulations, was applied on the fuselage sides and on the wings. This was followed by a large J on the tail and occasionally on the elevators. Apart from the J- regulation the overall finish and markings of the aircraft was left to the discretion of the owners.