This fic provides examples of the following tropes, in addition to those already present in the source material:
Adapted Out: Possibly the case with Kjelle, Yarne and Nah - none have been mentioned by the future children, and judging by Word of God, they might not exist in this fanfic's timeline. Given that an earlier chapter implied that Donnel was smitten with Nowi, though, this remains to be decisively seen.
Alternate Timeline: These are mentioned to exist, and it comes into play when we meet Malcom - who is Cameron and Anna's son from the Bad Future timeline, and exists despite Anna dying.
It's also mentioned that Cameron was present in the original timeline - Tom implies that he became a paraplegic because of an injury he got fighting the Risen the first time (in this fic, the early attack is noticeably not a result of Lucina time-travelling), and became quartermaster to the Shepherds as a result in order to be useful. In the main story, Lucina found him and healed him with Falchion, thus causing a divergence. All of the future children - including Mal, Noel, Mark and his indoctrinated-into-evil daughter Fire - are from the timeline where he was handicapped.
Now with the arrival of Eiryss, a third timeline almost identical to the original one is thrown into the mix, considering that she's actually a version of Fire, Mal's sister - whose last appearance in the story was travelling with Lucien.
As of Chapter 48, the D&N timeline is confirmed to exist as well, since Cameron entered it - or at least a version of it - when Tom sent him there after he almost died against Lucien, so that he can Level Grind a little more.
Lucien invokes this when he declares that, before the Time Skip, he will kill the first three people who enter the room he and Cameron are presently inside, and wonders whether he'll snag Chrom himself (and it's quickly made clear that he would succeed, easily). Of course, It turns out to be three unnamed Pegasus Knights, but Cameron still feels guilt for their deaths.
In the final battle against Gangrel, Gregor, Vaike and Anna all die, followed by Flavia succumbing to a poisoned injury that same night.
This can possibly extend to GODS.
Balance Between Good and Evil: Played straight. To bring Cameron and Julian to this world, the Old Man had to bring in two others - opposite to them in many ways.
Now that another Outsider has arrived, another Alternate showed up.
Crazy-Prepared: Future!Cameron, with plans detailing the location of every time-displaced children in a "In case of giant genocidal demon-dragon with horde of undead, break glass." bookcase. Sadly, Lucien showed up one day...
Killed Off for Real: Gregor, Vaike, Anna, Flavia... However, meeting Matthew, who came back thanks to his great deeds in life has Cameron wondering whether this trope can be subverted.
Let's Fight Like Gentlemen: General Mustafa offers to fight Cameron in an honourable, one-on-one duel to resolve the conflict between his forces and Chrom's, even promising that his men will stand down if he loses. Cameron points out that he can't convince Chrom to do the same, but it's enough for Mustafa that he's willing to try.
Luckily My Shield Will Protect Me: Cam's shield is ridiculously sturdy. As in "Capable of blocking Ereshkigal" sturdy. To the point where Robin actually considered a "let's-have-everyone-stand-behind-Cameron plan".
It's been destroyed.
Shield Bash: Or as Cameron put it: "time to Captain America it again"
Temptation to become a Fire Emblem version of Captain America is overwhelming. Use common sense.
...Common sense apparently betrayed me, because I just threw the shield at her head. Wait, did it hit? Awesome! Get it back before I die.
The Multiverse: Tom/Xane is just one of many people assigned to watch over a portion of reality - and on top of that each reality has some uncounted number of individual possible (and existing) timelines. For instance, there would be (according to Tom): at least one in which Lucina did not heal Cameron; one in which he didn't end up with Anna; one in which either Fire or Malcolm, neither, or both were taken by Lucien...
The Needs of the Many: Cameron's original reasoning for leaving Emmeryn to her fate - her sacrifice would inspire mass desertion from the Plegian Army, meaning less people would die as well as giving the Ylisse/Ferox alliance more able-bodied soldiers for when Valm attacks. Oh, and because Emmeryn would try to diplomacyWalhart.
Nice Job Breaking It, Hero: Saving Emmeryn might have seemed like the morally righteous thing to do (and Cameron lists off several reasons it would be helpful in the long run rather than acting For The Greater Good), but it definitely had negative consequences, as several people who weren't meant to die did due to Gangrel's army not being as demoralised (Anna among them). Julian also seriously starts wondering whether Emmeryn being in charge would be a good thing regarding the war with Valm, after seeing how aggrieved she is by the casualties of the Ylisse/Plegia conflict.
Otaku: Noel seems to be one for the Japanese language, much to her brother's dismay.
Reality Subtext: Around late 2013 and early 2014, the fanfic started to get rather dark tonally. Around this time, the author started to experience depression and attempted suicide at least two times, only not going through with it because his friends helped support him - this is echoed by Cameron (in the story) developing some Death Seeker elements as a result of losing Anna due to the war intensifying, and being unjustly blamed by his son Mal for it.
Word of God says this was always planned, it just had really convenient timing
Shipper on Deck: Cameron - being a Fire Emblem fan - is one. Particularly the Robin/Lucina ship.
His friends in the Shepherds - that is Stahl, Vaike, Kellam, Lon'qu and Gaius - all support his relationship with Anna. It's also mentioned that some people initially assumed that he'd hook up with Maribelle, given that she seemed to be Tsundere for him - given that Maribelle is like this with everyone, though, this was obviously not the case and came of it.
Shout-Out: Anna's son - Malcom "Mal" Yriel is captain of a ship called Serenity. Sound familiar?
When Robin mentions team killing, Cameron internally remarks 'Heh, keyboard shortcut for teamkills. Control-f-u'
Everyone who is part of the Pantheon.
Chrom of all people:
General Mustafa: ...I am loathe to kill you.
Chrom: That's a shame. I'm loathe to die.
Cameron:(internally)Did he seriously just quote the Princess Bride?!