Dragon Quest III/YMMV


 * Demonic Spiders - The chest monsters. Man-eating chests can kill your party in one or two attacks when you first meet them, Mimics have a One Hit Kill spell that will try to kill your party members.
 * Ensemble Darkhorse - The female soldier. She appears as various NPCs in future installments of the series.
 * Game Breaker - Depending on when your Mage or Sage gets it, the Transform spell can qualify as one. Having two or more of your best ally? Yes, please! Not much gear though (until the remix throws in quite a handful. The best is the Rubiss Sword, which has a colossal + 160 attack bonus, casts Thordain for free when used as an item, and everyone can use and equip it with no penalties.
 * Memetic Outfit - All of the classes, but particularly the hero's. If they aren't exact in games, they'll at least resemble them. They're mentioned in Dragon Quest IX, as equipment used by an ancient [class] of old. (Which kind of stings if you played III when it first came out.). Played with as Rule of Funny in Dragon Quest VII onward as the "Pod"/Pip and "Foo"/Conk families of monsters are tiny critters who dress like the default set of heroes in III, but are so tiny that they use leaves and hollowed nuts as armor, and use rocks and sticks as weapons.
 * Memetic Molester: The male Jester among the Japanese fandom.
 * Memetic Sex God - The females (the Sage in particular) are all ridiculously popular and together probably have more fan art than the rest of the franchise combined.
 * The male hero is the only one to even come close to any of the females, and he comes on strong in this category, as well, often depicted as amply capable of satisfying three female companions.
 * Seinfeld Is Unfunny - While the game aged very well, especially with the remakes, many modern gamers miss just how groundbreaking this game really was at the time. It is the Ur Example, Trope Maker, and Trope Codifier of many, many JRPG tropes. To truly cement this in one's mind, consider the following -- Dragon Quest III came out a scant 2 months after Final Fantasy I.
 * Tear Jerker -
 * That One Boss - Kandar is possibly the first difficult fight in the game.
 * That One Level - The cave to the Necrogond. Not NEARLY as frustrating as the Road to Rhone in the previous game, but tough nonetheless.