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It has to make sense, no Naruto shouldn't have sharingan, he gets too many powerups as is(same as dbz and goku, but vegeta was always last). So 10 eyes, you can have ninja with 1 or 2 sharingan eyes. They should have above average chakra levels to handle the sharingan and be more tactical to get things done in a more tactical way(i.e. itachi, kakashi, sasuke). These will all be 3T sharingan.