These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fan Translation: "Shibito" literally means "dead ones" or "dead people." Creative fan translations sometimes call them "deadites," after the Evil Dead franchise. "Yamibito" (yami meaning "dark") is sometimes creatively called "Darklings."
Narm Charm: The British voices from the first game can be this for some.
Nightmare Retardant: Yoriko Anno asking "is that a real gun?" served to be nightmare retardant.
Note: Handguns and rifles are illegal to own in Japan only shotguns are legal with stiff restrictions.
Also: Realistic-looking airsoft guns are popular toys over there. It's not actually a bad question.
Rescued from the Scrappy Heap: Yoriko Anno spends most of the early game whining about how miserable she is and bugging Professor Takeuchi or whomever else she gets partnered with. After she gets shot, however, and gets a blood transfusion from Kyoya Suda, she apparently gets a dose of his nascent Bad Ass-itude.
That One Level: Reiko escorting Harumi through the school in the first game. Mainly thanks to a game 'feature' where collected items aren't kept if you die and continue. Here, it's required that you use Harumi to grab an item just before the halfway checkpoint in order to proceed with the game, and so any deaths in the level will require you to start from the very beginning, lest you miss the item. Did I mention Harumi literally can't get anywhere NEAR a Shibito without dying?