Important items, or just "Important" as seen in-game, are key items for quests or utility items that can be used outside of combat.
Below is a list of each important item within the game's content, a more detailed list can be found in Important items.
The list does not contain items that can't be seen in the menu, like the Keys and polaroids.
Pages in category "Important items"
The following 94 pages are in this category, out of 94 total.