Formal title of your nation's leader?

[Astrakhstan]

"Dearest Leader, Comrade Chancellor Zara Bazhaeva"

Few actually refer to her in this way. It's usually "Dearest Leader" when addressing her directly, and "Chancellor Bazhaeva" when talking about her in third person.

[Shogunate of the Uzumaki Empire]

Generalissimo

[Autumns]

Article I of the Imperial Laws decreed that "the Emperor/Empress (or Witch-Queen) and Autocrat of All the Angmars is an eternal, an omnipotent, a totalitarian, and an infallible monarch. To obey his/her superior authority, not only out of fear but out of conscience as well, Kkwyt Himself commands". The article points to the reality that Angmar had an unrestricted pan-omniversal, theocratic totalitarian monarchy.

The full title of the Witch-Queen to this day (Art. 613 of the Imperial Laws) was:

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Her Most Imperial & Royal Serenity, Victoria I of Penetravir^☥, by the Splendor of Night: Witch-Queen and Autocrat of All the Angmars, Empress of Mordor, of Kislev, of Vladimar, & of Gorgoroth; Empress of Kagan, of Astarkan, of Polograd, of Függland, of Sibur, of chersonese Targan, & of Gorgia; High Queen of Two Vildannors, of Uldannor and Durannor; Queen of Pskhorv, of Smoronsk, of Vilduga, of Valovia, of Yarovlik, f Varaguz, of Shattuk, of Bishlakh, of Gunzugum, of Nibjaz, of Tashukk, of Fukkhar, of Oburuk, of Matthak, of Dagziz, of Ubundul, of Rakhar, of Thakkar, of Jindul, of Sharkagal, of Shatugur, of Burkhazgaruk, of Hargufund, of Jarukai, of Jarakal, of Jarkalai, of Jamagund, of Tharbek, of Dajagul, of Ushtarak, of Shukrak, of Vsenorov, of Shurgath, of Vargubuk, of Gundnithaz, of Gaskaragan, of Vragrar, of Kurgoth, of Bashthag, of Dizgis, of Dizgurus, of Liuthuthans, of Aiwanra, of Skupstaz, of Gijakgoltur, of Frumma, of Eisarnara, of Durutok, of Nishgath, of Shagur, of Shatrat, of Grishnakh, of Lurtzum, of Ardealun, of Triagonia, of Voloronya, of Nurn, of Khaplak, of Hagor, of Thagruth, of Pakhlak, of Sorgutz, of Kharg, of Orodor, of Harthak, of Fangroth, of Shargizh, of Dugrul, of Gubnak, of Azagol, of Azgarath, of Zarakhan, of Uruguth, of Shambutul, of Shurgaz, of Fikhtar, of Gozuruk, of Ushagaz, of Nagraluk, of Bugathuk, of Matragur, of Hakkum, of Rugun, of Pelun, of Tavroz, of Shilla, of Azgamgath, of Mislik, of Gartulguk, of Burku, of Thakku, of Hurkin, of Thiklak, of Kazorm, of Khazaduruk, of Vlich-Kharzul, of Morgai, of Bolgund, of Bashkhan, of Tikhrak, of Thargosh, of Bulgun, of Golbuk, of Fukhaz, of Grukh, of Nishrakhaz, of Shammeth, of Shizkhar, of Nazagral, of Framgahts, of Eisarnfon, of Drumma, of Ufarskups, of Dighazh, of Shizkar, of Nazaral, of Nilakh, of Zurguth, of Gibulukun, of Ushtarak, of Ertebus, of Gundurbuk, of Shatroful, of Ungolbar, of Lodrovna, of Angrathur, of Durgaluk, of Angrad, of Khartud, of Khadul, of Lurtzumbut, of Daghurk, of Sulmog, of Furguk, of Nishkargath, of Dalvengur, of Dalvator, of Thargul, of Voldor, of Kharzug, of Angoth, of Kharduk, of Muransk, of Orkul, of Arkhaz, of Nazgud, of Burik, of Barkhand, of Nagrok, of Ulturuk, of Turkhan, of Bishnath, of Ulgut, of Yusgard, of Kurbuk, of Khitark, of Daghkark, of Ulgrash, of Grishgul, of Thangrash, of Nashgur, of Sharkazul, of Gigarath, of Gilgan, of Gilgargath, of Mishkal, of Thargrath, of Mulgruth, of Thargurtuk, of Bargurath, of Gharguth, of Nisharguk, of Gukhagol, of Unguth, of Bagruth, of Hamaguth, of Garthak, of Gragutak, of Mirgutz, of Pakhran, of Harghal, of Shagrakth, of Nazabur, of Shillath, of Nisharguk, of Mathurk, of Gholgaz, of Mathrog, of Gundurgath, of Butgaz, of Nagrathark, of Tharbath, of Thakuluk, of Angrull, of Shatrugath, of Kharbugrath, of Khindak, of Bundurgul, of Ninuruk, of Khakrath, of Udulgoth, of Mazgath, of Magrosh, of Grashnikh, of Khilzak, of Durtak, of Samguz, of Birklash, of Thralbek, of Nigaruth, of Khagrakh, of Nishagak, of Burshatur, of Durfang, of Varisium et cetera; Archduchess of Tvar and Sovereign Duchess of Prezbrodonszky and the Country of New Gratz et cetera; Grand Duchess of Courlonde, of Semijlgaulja, of Lvyv, of Novijorsk, of Vyaroslavy, of Pyrmfost, of Korogia, of Fornland, of Smostka, of Belzerzorg, of Ordorfora, of Vyaroslavy & Novijorsk, of Vitebellia, Grand Princess of Vilduga & Pskhorv, of Khardan, of Vyatika, of Khargia, of Carnum Ador, of Cherogov, of Forgund, of Polovorik, of Gratzky, of Vlachnygrad, of Charnice, of Druznod,

holy shit that's long.

[Berkswell Village]

Head of State is Her Serene Highness Julia, Sovereign Princess of the Principality of Berkswell Village and its Dominions, Protectorates and Territories Overseas, Grand Duchess of Kenilworth, Countess of Knowle, Sovereign Grandmaster of the Royal Orders, Supreme Commander-In-Chief of the Royal Defence Forces.

Head of Government is His Excellency Sir Richard Quentin, President of the Council of Ministers, Special Minister for International and Intergovernmental Affairs, Member of the House of Knights for the Government District.

[Nazi Qroma]

Supreme Leader Adaophus Tih

[Kragholm Free States]

His Most Noble and August Majesty, Henryk Sebastijn I of the House of Drako, Lord Protector of the Realm, Duke of Kungsvik and High Warden of the Duchies of Södervik and Östervik and Grindvik, Governor-General of the Colonies of Saint Kristoff and Saint Ingrid and Saint Ansgar, Prince of Karalia, Governor-General of Skäggland, and High Warden of the Kragholmer Territories of Timor and Namkij and the Gold Coast and the Antilles, Grand Marshal of the Rikshaer and Grand Admiral of the Riksmarinen and of the Riksluftmarinen, Archbishop of the Lutheran Church of Kragholm, and Grandmaster of the Royal Order of the Chalice.

[The Intergalactic Russian Empire]

Her Imperial Majesty, Catherine VII of the House of Romanov, Hammer of the Germans, Emperess and Autocrat of all the Russias, of Moscow, Kiev, Vladimir, Novgorod, Tsarina of Kazan, Tsarina of Astrakhan, Tsarina of Poland, Tsarina of Siberia, Tsarina of Chersonesos Taurica, Tsarina of Transcaucasia, Tsarina of Korea, Lord of Pskov, and Grand Duchess of Smolensk, Lithuania, Volhynia, Podolia, and Finland, Princess of Estland, Livland, Courland and Semigalia, Samogitia, Belostok, Karelia, Tver, Yugra, Perm, Vyatka, Bulgaria and other territories; Lord and Grand Duke of Nizhny Novgorod, Sovereign of Chernigov, Ryazan, Polotsk, Rostov, Yaroslavl, Beloozero, Udoria, Obdoria, Kondia, Vitebsk, Mstislavl, Manchuria, and all northern territories; Sovereign of Iveria, Kartalinia, the Kabardinian lands, and the Armenian territories and Scion colonies

[Gonddor]

His Royal Majesty the High King of Gondor.

[Monte Cristo]

His Highness The Count of Monte Cristo, Defender of the People

In Italian:
Sua Altezza Il Conte di Monte Cristo, Difensore del Popolo

[Phoenicaea]

We have the President, which is the President of the Senate.
Then we have the Consul, the Censor, the main figure representing the unity of the nation resting the President,
the same which is the President of the Republic also referred, often called also as princeps

[Suvuna]

His/Her Excellency, __________________, Supreme Chancellor of the Federation of Suvuna.

[Feminist Union]

Her Majesty the Supreme Leaderess of the Feminist Union

[Greater Carloso]

The full title of Cárlos Esteban Tobón is His Excellency President of the Executive Council of the Federal Republic of Carloso Cárlos Esteban Tobón MP.

[Edreland]

His Majesty Albert II, King of Edreland and King in the West

The Honorable Nicholas Jardine, Prime Minister. (His Excellency is used in diplomatic correspondence)

[Nordengrund]

President of the Republic

[Lethen Empire]

His Majesty, Luka IV, Emperor of Letheny, King of Aldeny, Emperor of India, King of Guiana, King of Vinland, King of Aotearoa, King of South Africa, King of the West Indies, Imperator of Hinodia

[Bagong Luzon]

His (Philippine)* Majesty, Ferdinand the Second, King of New Luzon

* Title used when nationality is to be determined, e.g. in international treaties where more than one monarchy is party to.

[Kanussiya]

Car, Razym ii Telo iz Ŧi Stranyem ii Kaжdiy Lyud, Fris "Mama" Ceverya.

"Tsar, Mind and Body of The Country and Every Person, Frese "Mother" Ceverya."

[United Nation of Bedfordshire]

King- His Majesty King James Hamilton II.

Prime Minister- The Right Honourable Sir Paul Rodgers, MP, OBE, MBE.

Mayor of the City of Bath: The Honourable Tommie York, AM, OBE.

[Mermundoria]

Supreme Chief of Merfolk and Lord of Mermundoria.

Supreme Chief Tritune is currently leading the Confederation.

[Courelli]

The Courellian Leader, Joshua B. Thomas, is stylized simply the Governor of the Republic of Courelli.

[Shogunate of the Uzumaki Empire]

Prime Minister

[Minachia]

His Imperial Majesty Caesar Augustus Octavian Manius the Ninth, Emperor of Rome in its Seat of Caero-Minachia, King of Minachia, King of Caerland, Duke of Minachaeria, Count of Minachaeria.

[Dequarmi]

Chancellor-Minister Louis Hermainsch of Dequarmi and All Its Overseas Dominions, Total or Autonomous, Head of Parliament, and Supreme Commander of the Dequarman Armed Forces.

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All of the titles except "Chancellor-Minister" are usually omitted when referred to both directly and in third person. The full name of this title is usually used in diplomatic letters, but even then, in most occurences, the part about the Overseas Dominions is omitted.

"Supreme Commander of the Dequarman Armed Forces" is usually only used in military DOCUMENTS, both written and digital.

"Head of Parliament" was a title only mentioned in the Constitution and never used practically.

[Magnus Germania]

(Translated from German)
His Excellency, Supreme Leader and Chancellor of the Greater German Reich, Supreme Judge of the German People, First Soldier of the New Reich, High Protector of the Holy Mountain, Adolf Hitler. It's often just shortened to The Führer. "High Protector of the Holy Mountain" is not very common, rarely used in Greece, since the Holy Mountain is a mountain called Mt. Athos, which was voluntarily placed under Nazi protection during the war. Führer und Reichskanzler, or "Leader and Reich Chancellor" is the official name of the position/office.