Dokis ig?

Why are there several of the same character I don't get it

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Credit to https://www.google.com/search?q=doki+doki+literature+club&rlz=1CAOERN_enUS897&sxsrf=ALeKk00RN-opQAnSSKVhfOuaFuEDeyuvZg:1594732480955&source=lnms&tbm=i for the images.