* AlternateCharacterInterpretation: Is the player protagonist in ''Warrior's Way'' well-meaning in his ploy for WorldDomination or is he a straight-up VillainProtagonist?
* AnticlimaxBoss: ''Mii Force'' ends with... GiantHandsOfDoom. And not done well; the boss can be beaten in less than two minutes if done quickly enough.
* AwesomeMusic:
** "Save the World, Heroes!", the battle theme that plays in the later half of ''Find Mii II/[=StreetPass=] Quest II''.
** Dark Lord/Emperor's battle theme from ''Find Mii II/Streetpass Quest II''. Unsurprisingly, both of these songs end up remixed for ''Super Smash Bros for Nintendo 3DS''.
** Sadly for those confused by the lack of a "II" in the title of the ''Smash'' remix, the equally awesome final boss theme to the first game was ''not'' remixed in ''Smash''.
* CharacterTiers:
** In ''Mii Force'', Brown, White, and Light Blue shirts are better than other shirts. Brown and White can destroy purple plasma shots while Brown also gives a perpetual shield against physical attacks. The only drawbacks of Brown is that when it blocks a physical attack it launches you in the opposite direction, potentially into another trap and Brown shirts can be really hard to find. Light Blue shirts just have good range, rapid fire, damage, and destroy fire based attacks. While other shirts like Blue, Red, and Orange are good in general and other shirt colors are good in certain levels (2-3 for Black, 3-1, 4-1 and 4-3 for Light Green), Light Blue, White, and Brown are the best shirts to have on your ship during most levels of ''Mii Force''. They make arcade mode a bit easier. The only useless power is Dark Green. See TierInducedScrappy for details why.
** In ''Find Mii'', Yellow, Light Blue, Dark Blue, Red, Black, and White shirts are often required for passing certain levels. In addition, Red and Dark Blue magic is handy for armored enemies where, if not strong enough, can still deal damage that way, and Light Blue and Light Green magic can be handy against the Green Slime.
* ComplacentGamingSyndrome: In ''Find Mii 2'' you can kill everything with a health bar using only swords. If you take your [=3DS=] out to a convention somewhere you can even take down the [[BeefGate Diamond Golem]] with pairs of level 1's in a couple of hours. It doesn't help that the game expects you to find out about the hidden functions of each magic spell through trial and error ([[GuideDangIt how were we supposed to figure out the slimes are weak to Yellow Magic?]])
* DemonicSpiders: Any enemy that takes very little damage from your attacks, or uses any type of magic (e.g Fortifying Magic, Mirage Magic, Level Down Gas, Nullifying Magic) in ''Streetpass Quest 2''/''Find Mii 2''.
** Mummies are especially infuriating since they usually cost you a hero before you even do anything.
** Certain Reaper enemies will spew Cursed Gas, which often prevents your heroes from acting at all. A Dispelling Draft might as well be mandatory.
* GameBreaker:
** [=HomePassing=] (see the main page) and Play Coins. The latter has an exception on ''Puzzle Swap'', see ScrappyMechanic below.
** In ''Find Mii 2'' using Potions of Power, Dispelling Draft, and Team Attacks can pretty much destroy enemy gas effects and be enough to destroy tough adversaries without too much trouble. If you have an Orange Mii (or better yet two Orange Miis team up) and use magic to give their teammates extra attacks, combined with using other Miis to use Vial Of Valor to bring back people who have already attacked, even the FinalBoss can be defeated easily.
* LoveToHate: In ''Mii Force'', Gold Bone may be a jerk, but at least he's entertaining.
* MemeticMutation: Creating deformed Miis of Nintendo characters with slightly-off names. Examples include Lonk and Petch.
* {{Moe}}: Iris Archwell from ''Monster Manor''.
* RescuedFromTheScrappyHeap: Brown Shirts weren't that useful in ''Find Mii'', as they could only summon another hero, and it was always a random color. But in ''Mii Force'', they have a drill weapon, handy for defense.
* ScrappyMechanic:
** Some of the potions you order in ''Find Mii''/''Streetpass Quest 2'' may turn out to be defective, wasting your hero and your Play Coins. Thankfully removed in the update that included the additional games, considering they're by far the most expensive thing that consumes Play Coins in any of the games outside of hiring additional troops in ''Warrior's Way''.
** In ''Puzzle Swap'', using Play Coins to obtain pieces is not a surefire solution to a dearth of StreetPassers - the game can (and often will) give you pieces you already have, sometimes several in a row. This can become extremely aggravating when one repeatedly gets dud pieces on a panel with only one piece missing.
* StopHelpingMe: Mr. Mendel quickly falls into this. After playing the game for a while, many players will be shouting at Mr. Mendel to just shut up after repeating the same piece of advice countless numbers of times and just wanting to get to greeting the guests. It's even worse after one has grown all 80 plant breeds, because he'll still offer advice on how to grow new breeds. This is also unpleasantly averted by the fact that he stops wondering if any of your plant pals will come by, forcing you to memorize or write down the Miis that you've StreetPassed with more than once.
* ThatOneAchievement: Every game bar ''Puzzle Swap'' has at least one.
** ''Find Mii'' and ''Find Mii 2'':
*** Have fun beating both games ''10 times each.''
*** Beating the first game with 30 or less Miis is going to be very difficult if you don't get the right color characters, especially since you can't team up in that game.
** ''Mii Force'':
*** Level 3-3's fourth gem; you have to destroy both of the green Ferris wheels at the same time. Try doing this when there are a ton of projectiles flying at you.
*** The Level 4-3 third gem is notoriously hard to obtain; during the descending sequence, both of the huge submarines must be destroyed ''at the same time''. It's said the best way to pull this off is to use three level 3 Light Green turrets, colors that are very hard to come by without spending Play Coins.
*** Getting {{No Damage Run}}s on each level also qualifies for this.
*** Destroying both of the Final Gold Bone robot's hands is insanely difficult without the right weapons, and even then it's tricky not to keep getting hit while trying to destroy his flying fists at the same time you attack.
*** Defeating [[NintendoHard Arcade]] [[ThatOneSidequest Mode]] counts for this in spades.
** ''Flower Town'':
*** Growing all 80 flowers.
*** Completing the job list, even more so with Gold Medals.
** ''Warrior's Way'':
*** Getting a critical strike in a battle, mainly because of it being a LuckBasedMission.
*** Obtaining the "battle 300 visiting monarchs" plaza ticket. Depending on where you live, this can be almost impossible to achieve. And even in an area with lots of 3DS users, it can still take a very long time.
** ''Monster Manor'':
*** Finding all 40 weapons, since that is one of Street Pass's greatest {{Luck Based Mission}}s.
*** It's hard enough to find all of the puzzle boxes, let alone complete all of them, especially the later ones which all qualify as ThatOnePuzzle.
* ThatOneBoss:
** Emperor Fynalle in ''Warrior's Way'' has 8 times as many troops as you do you when you first face him, you can't spy on him to find out what kinds of troops he'll use, and the match goes on for 5 rounds instead of the usual 3.
** The final fight with Gold Bone in ''Mii Force''[='=]s Arcade Mode is this, unless you somehow still have most of your weapons with you.
* ThatOneLevel:
** ''Find Mii''/''[=StreetPass=] Quest'' has a lot of these, mostly revolving around finding a Mii with the right ability at the right time. An update has allowed you to hire past heroes, however, alleviating the problem provided you've found at least one Mii with the needed shirt color. Even so, there are still some hair-tearingly frustrating rooms:
*** Colored shields block all sword attacks except from heroes with a shirt of matching color. Magic goes around the shield, but at half damage. [[LuckBasedMission God help you if you don't have a friend to change their shirt into the color you need.]] The worst room of this kind is the first Forest of Sorrow room in the Secret Quest of ''Find Mii''/''[=StreetPass=] Quest 2''. It contains two green slimes, which cannot be damaged by magic and have absurdly high evade rates against sword attacks (but only 3 HP), and one of which is defended by a shadowlight shield, which requires a black/white team to break.
*** Rooms covered in darkness can ONLY be passed with White magic, forcing all other heroes in front of the White hero to flee immediately upon entry. Unlike shield rooms, you can't re-order your heroes to put White in front. And no matter how many heroes you hire, if none of them are white, every one of them runs away and no progress is made. At least you never have to light the room again on that playthrough once you light it once.
*** ''Streetpass Quest 2''/''Find Mii 2'' goes beyond the frustration of darkened rooms with fire rooms requiring two Dark Blue heroes to put out the flames, poison rooms that require two Yellow heroes to send away the poison, and ice rooms that need two Red heroes to melt the ice.
*** The Sealed Passage in ''Find Mii 2''[='=]s Secret Quest. It contains a powerful Mummy enemy and the Reaper General. The Mummy will scare away your Miis while the Reaper spews curse gas and has a defense of 2. And although you might think it would be best to get rid of the weaker Mummy first to save your Miis, if you do, then the Reaper will REVIVE it with full HP!
*** The Ransacked Ruins/Dolorous Deepwood route through the Secret Quest in ''Find Mii''/''Streetpass Quest 2'' could be described as That One Route. It features two rooms with enemies behind yellow shields, two poison rooms requiring two Yellow Miis each to get past, a room with two green slimes (one behind a shadowlight shield), a Rampaging Mummy (''guaranteed'' to scare away the first Mii that enters the room), and the same ice room followed by a darkened room with a curse gas-spewing Reaper Commander that lie at the end of every route.
*** If you follow the Diabolical Altar/Ominous Shrine/Sealed Passage route through the Secret Quest, then you will have to fight, in a row, a Roaming Mummy and a Marauding Mummy (one of which will likely scare away the first Mii), a Rampaging Mummy (60 HP, guaranteed to scare away the first Mii), a Golden Golem (defence rating of 2 and 65 HP, so a OHKO is only possible with a Level 15 team and support magic) in a frozen room, a Reaper General (defence rating of 2 and 75 HP, making a OHKO difficult even with a Level 15 team and support magic; also spews curse gas and will completely revive the Marauding Mummy in the same room if you kill it first), a Diamond Golem (defence rating of 2 and ''85'' HP, making a OHKO nearly impossible), a Reaper Captain and a Marauding Mummy in a frozen room, and a curse gas-spewing Reaper Commander and Armored Demon in a dark room.[[note]] The last three are part of every route in the game, but are bad enough without the long parade of frustrating enemies that precedes them in this route.[[/note]]
** Bone Rattler, the roller coaster level in ''Mii Force'', makes the game into a literal rail shooter, only letting you move vertically, and there are two forks in the path. Especially annoying in that you must take the hard routes in order to get some of the treasures.
* ThatOneSidequest:
** In ''Mii Force'', it's beating Arcade Mode.
** In ''Flower Town'', completing any job with a specifically colored flower. Unless you get ''very'' lucky, you'll need to plant the seed with another Mii with the appropriate shirt color, which may require a lot of patience if it's a less popular one. Completing any job requiring a specific ''height'' of flower (especially for gold medals) is even more frustrating, as obtaining a suitable seed requires pollination from a flower of the appropriate height, and even then it is not guaranteed that it will grow into the correct breed at the correct height.
* TierInducedScrappy:
** Dark Green Miis, whose abilities are practically useless in both ''Find Mii'' and ''Mii Force''. In ''Find Mii'', they double your next warrior's level. It sounds nice but unless you have a bunch of level 1's and the Dark Green is in front then it's worthless. In ''Mii Force'', Dark Green gives a bouncing ball which does bad damage unless bounced off an object, has bad attack radius, and offers no defense like Brown or White shirts do.
** In ''Warrior's Way'', people who have no street passes, thus their army consists of a single useless soldier.
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