History VideoGame / TheLegendOfHeroesTrailsFromZeroAndTrailsToAzure

* DoppelgangerAttack: Yin can create duplicates during battle. Fortunately they have less HP and fewer attacks than the original. Unfortunately, they still have the attack with the 90% chance of inflicting Death. [[spoiler:Rixia manages to lose this ability when she joins you, both masked as Yin and as herself, probably because it would break the difficulty otherwise]].

* DuelingHackers: Tio and Jona versus [[OnlineAlias Kitty]]. Since the Orbal Network that functions as a rudimentary internet also provides the power to the computers and those computers are running the International Bank of Crossbell, the simple solution of unplugging the machines either from the network or entirely isn't really an option.

* LandOfOneCity: Crossbell State does have some smaller towns and developments, they're all just exurbs of Crossbell City. Justified in-universe by the political situation that led to its existence in the first place and the fact that it's so small that there isn't really room for a second city.

* HauntedCastle: The Moon Temple appears this way when you first visit it, being haunted by undead spirits and demons. Once you clear it out, it's actually quite pleasant. The Sun Fort also comes off this way, being a largely ruined and monster-infested structure. [[spoiler:The D∴G Cult sets up shop in its depths, thus contributing to the atmosphere]].

* HeroOfAnotherStory: Even moreso than in ''Trails in the Sky''; Investigator Dudley, Arios [=MacLaine=], Wazy Hemisphere and the Seeker sisters all definitely feel like this and many join the party for a bit. Natch for Estelle & Joshua, too. [[spoiler:In fact, those two quite ''literally'' have another story going on in the background for a significant portion of the game, in the form of their search for Renne, which eventually intersects violently with the main plot]].
** Interestingly, ''most'' of these characters also join the party in ''Trails to Azure'', with Noel and Wazy acting as more or less permanent party members. [[spoiler:The Brights (now including Renne) also reappear in ''Azure'', and played major role in the Crossbell invasion]].

* InstantAIJustAddWater: [[spoiler:Pater-Mater was already intelligent, but by the end of ''Zero'' it's grown enough that it is able to choose to [[AIIsACrapshoot ignore what Renne tells it to do]] in favor of doing what Renne really ''wants'' but is too scared of rejection to contemplate]].
** In ''Azure'', [[spoiler:it even uses its newfound sentience to pull a HeroicSacrifice in order to protect Renne]].

* JurisdictionFriction: The 1st Department of the Crossbell Police like to step in on all the interesting cases, to the annoyance of both the 2nd Department and the Special Support Section. This also exists between the Bracers Guild and the CSPD as a whole during the events of Zero. Both issues generally go away after the SSS proves themselves to the rest of the city and restore the faith of the people in their police.

* LandOfOneCity: Crossbell State does have some smaller towns and developments but mostly, it's Crossbell City. Justified in universe by the political situation that led to its existence in the first place and the fact that it's so small that there isn't really room for a second city.

* LateArrivalSpoiler: ''Azure'''s promotional materials have ''oodles'' of these for ''Zero'', especially concerning [[spoiler:Rixia and her actual skills and place in the world]]. Magazine promotional articles have also openly spoil many plot elements from ''Trails in the Sky SC''.
** [[DoubleSubversion Double Subverted]] by Lechter. The promotional materials for ''Zero'' and ''Azure'' didn't shy about revealing [[spoiler:his occupation and alignment]]; yet they keep their mouth shut when it comes to [[spoiler:his relationship with Kloe (which is half of the reason of his existence in the first place)]].

* TheNicknamer: Randy likes coming up with nicknames: Mademois-Elie, Tio Tot, [=KeDo=], Jon-ster, Sulldier...

* PointOfNoReturn: Walking into [[spoiler:Marconi's secret vault]] in ''Zero'' functions as one of these, as afterwards you completely lose the ability to wander around freely. The game flat-out tells you this and to not proceed until you're sure you've done everything you want to.
** ''Azure'' mostly avoids this. You're led to think walking into the very same room will lead to this, but it's just a long PlotTunnel and you have free access to almost all of Crossbell State once TheVeryDefinitelyFinalDungeon appears. In fact, short of starting the FinalBoss, you're allowed to return to Crossbell at any time ''during'' the dungeon.