In this universe, the arrow injured the Blue Spirit instead of knocking him out, so Aang didn’t find out who was behind the mask. To Zuko, it seemed simple enough to maintain the disguise – just don’t take it off and pretend to be unable to speak. First of all, he needed the Avatar’s help to remove that arrow, and then he found out that the Avatar needed help himself, for his sick friends. Unwilling to leave two people to die, even for his long-sought goal, Zuko decided to use the disguise to infiltrate the Avatar’s group and find out useful information on his enemies that way. It seemed so reasonable, but then he found himself traveling with the group, and helping them out to maintain his disguise, and it all got out of his control fast.

So as far as the Gaang was concerned, Blue was someone who’d just rescued Aang and continued to be a good ally and later, friend. Zuko found such naïve trust ridiculous, but all the same, it was hard not to respond to it, or to dislike them for it. As Zuko struggled with the way that the Avatar and his companions were nothing like he expected, he began to realize that perhaps, he’d been wrong about some things – about the Avatar, about friendship, about the role of the Fire Nation in the war… Zuko believed in living by his father’s harsh rules, but he couldn’t easily apply them here. In turn, the Gaang also learned to see some new perspectives. Slowly, all their destinies began to change.

None of them expected so many truths to come through the lies.

A ForWantOfANail AU. The story can be found [[http://www.fanfiction.net/s/6904038/1/ here]].

!!Tropes:
* AbsurdlySharpBlade: Played straight at first, then subverted in Chapter 14, when Zuko explains how he cut through the chains holding Aang. Turns out the chain was designed to be soft(though still strong enough to hold a human being), so if it were to be heated up by firebending it would exploded, with the chain acting as lethal sharpel.
* AccidentalTruth: See the story summary.
* AnnoyingArrows: Subverted. The reason Zuko isn't bothered by[=/=]doesn’t notice the arrow initially is due to nerve damage. Also somewhat averted, since once he knows about the arrow, he knows that he needs immediate medical attention.
* BadassNormal: Zuko, in his persona as Blue.
** EmpoweredBadassNormal: [[spoiler: Now as of Chapter 23, when Blue reveals to the gaang that he's a firebender]]
* BecomingTheMask: The more time Zuko spends as Blue, the more his Prince façade, his Blue façade and his 'true' self all start to mix together.
* BelievingTheirOwnLies: Chapters 17 and 18, where Zuko confuses the hell out of Toph, and also ties himself in knots when Aang and Toph point out logical fallacies in his defense of his banishment.
* BondingOverMissingParents: Happens between Zuko and Sokka and Katara early in the story.
* CastFromHitPoints: What Zuko does to disable [[spoiler: the drill]]. A relatively mild example, however, as he recovers afterwards.
* ChangeTheUncomfortableSubject
* ChekhovsGun: The medicine that Zuko gives the Gaang in Chapter 1 is used to treat Iroh’s wound in Chapter 17. Sewing is used to identify Blue after a long absence and a marked change in appearance, and WordOfGod is that [[ChekhovsSkill sewing will pop up again.]]
* ChildrenAreInnocent: How Zuko views the Gaang after having gotten to know them better.
* {{Cliffhanger}}: Used infrequently but effectively.
* ConflictingLoyalty: Zuko is slowly developing a case of this as he spends more time with the Gaang and becomes closer to them.
* CoolMask
* CoolSword
* CrypticConversation: Every conversation Zuko has with [[spoiler: Spirit!Blue]] is one of these. Iroh is also fond of them.
* DealWithTheDevil[=/=]BargainWithHeaven: Zuko’s deal with [[spoiler: Spirit!Blue]] in Chapter 20.
* DePower: According to chapter 14, the surviving Air Nomads were so grief-stricken over the genocide that the were all depowered, and no new airbender had been born for some time.
* DidNotThinkThisThrough: Zuko doesn’t know how he’s going to keep Aang captive after they get out of Pohuai Stronghold.
* {{Foreshadowing}}: WordOfGod has stated that [[spoiler: the blue dragon imagery that Spirit!Blue]] occasionally uses in communication with Zuko is foreshadowing.
* TheGuardsMustBeCrazy: Played straight, subverted, and lampshaded. Whenever dealing with a difficult Fire Nation Officer, Zuko notes that, despite the inconvenience it places on him, the Fire Nation really needs more men like that. He even makes a mental note to follow one guy's career should he get back in a place of power.
* GossipEvolution: The whole reason the Blue Spirit's reputation gets more fearsome every time it's mentioned.
* HandSignals: Zuko and Mai have a large vocabulary of them. Toph and Suki also use some with each other.
* HealItWithFire: Zuko and Iroh both use the straight version; [[spoiler: Zuko goes on to develop a more metaphorical version that he teaches to Iroh]]. The consequences of burning self in the straight version are handwaved through a) Iroh has Just That Much Control, and b) ability to apply incredibly helpful healing salve afterwards.
* HoldingTheFloor: Toph pulls this in Chapter 22 to give the approaching Blue a chance to end the standoff between the Gaang and [[spoiler: Mai]].
* HonorBeforeReason: It’s Zuko – what did you expect?
* ItWasAGift: Zuko has a number of these. (He started out the story with the Earth Kingdom dagger and Mai’s heartstone; now he also has the slate and bedroll.)
* LaResistance: Sokka thinks that Blue might be working for a resistance group. There is also the Order of the White Lotus and the conspiracy started by [[spoiler: Zuko’s former crew with the goal of forcing the Fire Nation’s military command structure to change]].
* MemeticBadass: Zuko!Blue, in-universe.
* TheMutiny: [[spoiler:Jee and the rest of Zuko’s former crew]] stage a minor one after the Siege of the North when they go back to try and rescue any survivors of Koizilla’s attack. Also, it’s mentioned once that Zuko faced a mutiny from his crew about a year ago.
** They're also plotting a long-range resistance conspiracy thing, largely in Zuko's memory while they believe he's dead. After they find out he's alive, they ponder whether or not to recruit him and Iroh.
* NonSequitur: [[spoiler: Spirit!Blue’s]] initial means of communication with Zuko tended to be inserting one of these into Zuko’s train of thought.
* ObliviousGuiltSlinging: The Gaang does this to Zuko rather frequently with their little shows of trust in Blue.
* OnlySaneMan: Sokka is this for Aang and Katara when they first meet Blue. Also, Zuko believes he is this when he’s traveling with the Gaang as Blue.
* ReassignedToAntarctica: Every member [[spoiler:of the crew of Zuko’s ship was assigned to it as punishment. Also, as punishment for their minor mutiny after the Siege of the North]], they get assigned to a dead end patrol.
* RoyalsWhoActuallyDoSomething: The Fire Nation royal family, which isn't very surprising.
* ScrewTheRulesImDoingWhatsRight: Aang's old friend Kuzon placed his life at risk to help the surviving Air Nomads escape the Fire Nation and find sanctuary, eventually leading them to a refuge in the Foggy Swamp, which was abandoned when Aang found it: what happened to the people there is unknown.
* ShownTheirWork[=/=]WordOfGod: Much of the background research and information for the story, as well as some of the future developments, are discussed in the comments of [[http://maguena.livejournal.com/6408.html this post]] on the author’s Livejournal account. '''Warning:''' Heavy spoilers abound in the discussion.
* SnowballLie: See the story summary.
** InventedIndividual: Blue Spirit Lee.
* TheSpeechless: Zuko!Blue is this in-universe.
* SpiritAdvisor: [[spoiler: Spirit!Blue for Zuko.]]
* StealthHiBye: Blue always arrives this way when he's meeting up with the Gaang.
* TheStoic: The Gaang assumes Blue is this. He kinda is.
* SupernaturalAid: [[spoiler: Spirit!Blue]] has given this to Zuko a few times.
* ThisMeansWar: Invoked in Iroh’s thoughts when he finally learns that Azulon had ordered Ozai to kill Zuko and that Ozai had been going to do it.
* TheVoiceless: What Zuko!Blue is for the reader.
* WarriorPrince: Zuko. Iroh used to be one.
* YouCantGoHomeAgain: Zuko notes that Aang, even if he wins, has nothing left to go to.
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