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In 200 BC a group of Germanic peoples roughly equal to population of Magna Germania are teleported to Japan. They quickly subjugate both the Jomon and Yayoi people, assimilate 0% Asian them and as a result they gain some 20-30% Asian DNA. Language is unaffected.
What interesting directions could Proto Germanic take in such a scenario? The Germanic Japan will be culturally influenced by China and will not even know of Europe for good 1700 years in the best case.
Could this Japanese Germanic language borrow areal features like classifiers, limited number of syllabes etc