Aloof Big Brother: Averted. He may try to act the part, but when it comes to his sister and even Austria, it doesn't really hold up.
Crazy-Prepared: If the alarm systems, emergency measures and constant need to have guns close by don't give it away. Not to mention Truth in Television, also considering the fairly lax gun laws and mandated fallout shelters scattered across the Alps.
Cruel to Be Kind: He was responsible for destroying most of the outward evidence directly linked to Austria's secret relationship with Hungary early on after Doomsday. This was done not only to protect Austria's reputation but also in the belief that there's no one waiting for him at the other end. He was right...sort of.
The Fettered: Switzerland sticks to a particularly disciplined if fervent interpretation of "freedom" and "independence." One has to wonder what he would be like without Liechtenstein or even Austria to rein him in.
Genre Savvy: He knows more than a thing or two about survival and World War 3 cliches. Which also becomes a plot point in Austria's arc, as he figures out early on that Austria's Hope Spot for Hungary wouldn't end well.
The Gunslinger: He always has a firearm with him at all times. Always.
Old Maid: Subverted in the future scenes, as she "ages" much slower than Austria and even Switzerland. She's described as still pretty much as she always looked, with a few slight wrinkles.
Not Blood Siblings: She uses this to justify where her relationship with Switzerland is headed.
Plot-Relevant Age-Up: Following Doomsday, she's shown to have physically grown older, looking even more like a lady. Justified in-verse due to her increased power and eventual role as the heart of the Alpine Confederation.
Plucky Girl: Like she's always been, though even more so after the bombs fell. All while still maintaining the image of an innocent if wise-beyond-her-years lady.
Proper Lady: Despite the age-up, her innocent yet mature facade survives intact. She even wears slightly older versions of her regular dresses.
Sibling Yin-Yang: Compared to Switzerland, she's considerably more gentle and caring.
Silk Hiding Steel: She can be very assertive and forceful whenever she wants to...and all done with a (usually) calm, mature voice. It's also telling that there are hints that she would be the last one of the original Alpines to pass on.
Technical Pacifist: She's quite diplomatic, though there are hints of Switzerland's influence rubbing off on her.
Anxiety Dreams: The years had taken their toll on even his subconscious. And from the looks of his dreams and nightmares, it isn't a very stable or sane one either.
Adult Fear: He's afraid of telling Sopron outright that he's her father, for fear of what this could do to her and their relationship. That is, until The Vanishing Shadows, which has him voicing out the fact that she's his daughter.
Beware the Nice Ones: It's strongly implied that he managed to hold his own against invading soldiers during Doomsday. Likewise it's revealed through dreams and the raid he leads on a wasteland camp that he's no stranger to battle either.
Bling of War: He prefers to go to battle in old-style dress uniforms.
Blue Blood: Like in Hetalia, he composes himself in public like the long-extinct nobility. Usually.
Dark and Troubled Past: He considers and tries to justify some elements of his "predicament" as some of his less noble acts finally catching up to him. Also lampshaded when he mentioned that he's done some "regrettable deeds" in the past.
The Determinator: Compared to the other Alpines, he took in a lot of punishment from Doomsday.
Dichter And Denker: He still takes pride in his people's culture and achievements. And is a skilled musician to boot if his skills with the piano mean anything.
Ermine Cape Effect: Subverted. Doomsday left little use for fancy clothes, with Austria using old suits and outfits for the most part. Later on averted when he goes into a battle wearing an old dress uniform from his Imperial days.
Fashion Dissonance: He's usually seen wearing suits and outfits that wouldn't look out of place in World War I or just about any time before Doomsday.
The Fettered: He holds himself in check through sheer force of habit as well as his love for his people, Sopron and Hungary.
Fighting from the Inside: By 2009, his internal struggle for his own sanity has started to turn against him. Until Hungary finally intervened.
First Gray Hair: He experiences this initially to his horror, as it signifies the beginnings of his eventual demise.
Glory Days: He's hasn't forgotten his old Imperial days as a major power. Even before Doomsday, he's shown to have lost a little of his touch, which only serves to emphasize how far he's gone.
Ill Boy: He's described early on after Doomsday as not only bedridden. But also suffering scars and burns on his body...which never fully healed even by the 2000s-era fics and is strongly hinted as growing weaker with time. By the future fics, he's weakened to the point that even his piano skills had deteriorated.
Impoverished Patrician: Very much so. Though it doesn't stop him from acting and composing himself like an aristocrat.
Knight in Sour Armor: His public facade can come across as stern and aloof, though he really does try to live up to his virtues.
Kuudere: In private or with those closest to him, he does show his softer side.
Changing of the Guard / Passing the Torch: It's lampshaded by Liechtenstein herself that he would ultimately replace the Alpines altogether as the embodiment of the entire Confederation. Although it's also mentioned that his parents would still be around for quite some time yet.
The Atoner: He's trying to be a guiding figure to the German wastes to make up for just about all his past wrongs.
Awesome Ego: His pompous, seemingly self-absorbed antics aren't entirely full of hot air.
Badass: One of the many things he thinks himself to be. Though then again, it's not entirely groundless.
Beergasm: Really likes his beer, to Austria's perpetual annoyance.
Berserk Button: Much of his days as East Germany. Given his experiences in the Cold War and the lack of any real Ostalgie for the DDR, it's justified in-verse. And for a time, any mention of his brother's death.
Blood Knight: He still has some shades of this, especially in battle. His own king even had to make sure he didn't have any weapons in his meeting with Poland.
Break the Haughty: He did not take his brother's death or those of France and Belgium all that well. At all.
Broken Bird: Probably, though like Austria, he tries to hide it.
Butt Monkey: He's clearly trying not to be. Though he doesn't get much respite if Hungary or her daughter's around.
Combat Pragmatist: While he does enjoy a good honest fight, he's not above using anything on hand (like grenades) when push comes to shove.
Cultural Posturing: Though not that excessive, he doesn't hesitate pointing how awesome Prussian people, culture and achievements are, not to mention himself.
Days of Future Past: Lampshaded, with Prussia noting how Doomsday, for all its chaos had ironically given him and his people another lease on life.
The Determinator: Not even a nuclear war could end him. It's also strongly implied that he's going to be around for quite a while. Still, it wasn't easy at all.
Dreaming of Times Gone By: Like Austria, it's justified. He can still remember and conjure up memories that would be considered footnotes in a history book.
Gas Mask Mooks: His first impression is as being like one. It probably helps that he actually has an old gas mask on hand.
Glory Days: Something like that is starting to return for him, although he still misses the old days.
Glory Seeker: He's determined to regain his old power by any means necessary
Heroic Albino: What he strives to be, even if his regular antics say otherwise.
Heroic BSOD: Implied to have experienced this upon finding out that France, Holland, Belgium and his own brother are long dead.
Hidden Depths: He does have a sensible and reasonable side besides all the Hot-Blooded antics, as well as being smarter and more Genre Savvy that he's usually credited for. If his meeting with Sopron is anything, he's also friendly to kids.
Berserk Button: Mentioning his experiences of the Cold War, especially if it has anything to do with Communists is not advised.
Beware the Nice Ones: Not only did he soundly give Prussia a beating despite technically losing in the "Polish Adventure." But it's implied that Prussia's dream-visit by Hungary was partly his idea.
The Determinator: Surviving a nuclear war and having your very people divided into two camps isn't easy at all.
Enemy Within: Like in the source material, Poland's split between a Communist West and Democratic East...both claiming to be the same country. This is translated in him developing a virtual split personality.
Glory Days: While not exactly on the same level as Prussia or Austria, he clearly misses his days as a great power and doesn't hesitate to bring up the Battle of Grunwald.
Heartwarming Orphan: His own people took good care of him after he was found in a refugee camp.
The Unintelligible: Clevish, his local dialect is described as virtually impossible to understand for a standard English-speaker. Somewhat subverted in that he can, and does, speak standard English when he has to.
A Form You Are Comfortable With: Post-death, she usually tries to appear as when she's still alive. But while successful for the most part, she's not afraid to let slip hints of her true form through it...not to mention change to a more decayed version if need be.
Action Girl: Neither the Cold War nor dying kept her from being good at fighting. She's revealed to have since become an Action Mom as well.
Chickification: Averted. Like in the source material, she's shown to be strong and masculine despite the Girliness Upgrade. She even tells Austria outright that she chose undergoing the painful ordeal by her own will.
Death by Disfigurement: She's described in her last days alive as being burned and scarred virtually beyond recognition, apart from the flower in her hair.
Death Glare: Almost literally, when she's really pissed off.
Nightmare Fetishist: She knows how to freak people out. The forms she takes when not physically there are also described as "unnerving," although she could also legitimately frighten people is she has to drive a point home.
Ninja Maid: While not an actual maid outfit, some of her clothes, which are based on Hungarian country/folk dresses can give this impression.
Think Nothing of It: It's made clear that Orleans doesn't want anyone to praise or worship her especially given her past and present identity as a saint. She would rather like to go about her "new" life and role peacefully.
Jean Burnel, a horror writer from a French survivor-nation, is shown to be the same one from the source material.
Dr. Cayne Armand, the envoy visiting the survivor-nation of Orleans is also from the source timeline.
The Everyman: Jean Burnel. Although this is somewhat subverted in that he's something of an accomplished novelist who hasn't quite gotten the hang of his own popularity in-verse, as well as being an (unwilling) accomplice in Sopron's kidnapping. But when compared to the Nations, he's pretty much the closest to this trope.
Evilly Affable: Col. Viktor Andrei tries being this, which only comes across as even more forced.
Generation Xerox: Austria's aides are mentioned as belonging to the same family line that's been in his employ for generations.
Intrepid Reporter: Jean Burnel in The Vanishing Shadows is this in a sense, given his original intention of researching the Hungarian Wastes. He got more than he bargained for.
The Masquerade: Apparently, only a handful of people outside of the government and select groups know of who/what the Nations really are. This is mixed in with an unspoken "gentleman's agreement," explaining why the rest of the world is still unaware.
Renegade Russian: Some of the ones plaguing the Hungarian Wastes are former Soviet soldiers who survived Doomsday, only to devolve into bandits and warlords, like Col. Viktor Andrei.
Royals Who Actually Do Something: Princess Anne of Cleveland is explicitly shown as one, among others. Subverted in the case of Otto von Habsburg, whose dreams of bringing down the Iron Curtain between Austria and Hungary never came to pass.
Small Name, Big Ego: Former Col. Viktor Andrei from The Vanishing Shadows is implied to be this trope. Although he's shown in-verse as a notorious (and vile) figure who's crossed paths with the Nations before, his efforts to kidnap Sopron go way over his head. Which is not helped at all by his delusions of grandeur in serving his mysterious employers.