The phrase "most Japanese" can be substituted with a variety of synonyms depending on the context of the sentence. Some alternatives include "typical Japanese," "traditional Japanese," "stereotypical Japanese," "representative of the Japanese culture," or even simply "the average Japanese person." It's important to note that while these terms may be interchangeable, they aren't completely interchangeable in all situations. It's always best to choose the synonym that best fits the intended connotation and meaning of the sentence. Nonetheless, these synonyms expand the variety of ways to express the same concept of Japaneseness.