The full title of your head of state

[The Piratini Republic]

The title of the head of state is simple.
"His Excellency, Basileu Guimarães, Minister-President of the Piratini Republic" or in Portuguese, "Sua excelência, Basileu Guimarães, Ministro-Presidente da República de Piratini."

[Roedean]

The Right Honorable Niro Belisarius.

[Berenpleed]

Supreme Leader Of Berenpleed

[Shurdington]

His Serene Highness George the Fifteenth, by Ancient Folkright Prince of Shurdington and Alderman of Saint Claire.

[Appalachia]

The president's full title is His/Her Excellency [name], [x] President of the Republic

This makes our currently leader Her Excellency Eleanor Scotts, 7th President of the Republic

Colloquially Mr./Madam President is used, but the President is referred to as "His/Her Excellency" in formal ceremonies and underneath their signature on official documents.

[Tamri3l]

Emperor: His Imperial Highness Titus Mede III, Emperor of Tamriel;

Prime Minister: His Excellence Caius Tullius, Prime Minister of Tamriel.

[The Union of British North America]

The British monarch is also the North American monarch, as the British Crown is shared among full members of the United Commonwealth and whoever wears the British Crown is also holder of the title of Head of the External Association that a state may have with the United British Commonwealth of Nations. The British monarch is the official head of state of the NAU and the several nations of the UBC.

Full title and UC-wide title: His Majesty Charles III, by the Grace of God, of the Nations of the United British Commonwealth, King, Head of the External Associations of States with the United British Commonwealth of Nations, Defender of the Faith, Emperor of India

Full title, NAU-focused: Charles the Third, by the Grace of God, of the North American Union and the other Nations of the United British Commonwealth, King, Head of the External Associations of States with the United British Commonwealth of Nations, Defender of the Faith, Emperor of India

Short form, colloquial names: King of the North American Union, King of North America, King of America, the King-Emperor (this one is used pretty much everywhere by everyone)

Title as Monarch of a North American Province: Charles the Third, The King in Right of [Name of the Province] and Protector of the First Nations within [Province Name].

The President-General is the Crown's representative in the NAU (federally), and is the de facto, national head of state, as he is North American.

His Excellency the Right Honourable President-General of the North American Union and Commander-in-Chief in and over North America, Sir John Cabot-Lodge, 11th Baronet

[Borovan entered the region as he]

It's basically leader or President.

[Couray]

The monarch is most commonly referred to as the Forsenna or Forsennu; "princess" or "prince", respectively.

The full title of the current princess would be Sa Forsenna Belesida sa Coreu, Malicua sa Chi Kihinu, Menbul sa Saha, roughly translating to "The Blessed Princess of Couray, Queen of the Kihin, Arbiter of Harmony."

[England and West Africa]

Richard VI, by the Grace of God, of the United Kingdom of England and West Africa and of his other realms and territories King, Head of the Commonwealth,, Defender of the Faith

[Jerdena]

His/Her Excellency [Name], President of the Republic of Jerdena is the formal title, but most people simply call the president Mr. President.

[Sunrisia]

His or Her Excellency President (First Name, Middle Name, Last Name) of the Nationalist Republic of Sunrisia.

Pretty much similar to the above answer.

[The Austro-Hungarian Monarchy]

His Imperial Majesty Franz Joseph, Emperor of the Romans, Basileus of Eastern Roman Empire, Emperor of Austria, Apostolic King of Hungary,
King of Bohemia, of Dalmatia, of Croatia, of Slavonia, of Galicia, of Lodomeria, and of Illyria,
King of Jerusalem, Archduke of Austria, Grand Duke of Tuscany and of Cracow, Duke of Lorraine, of Salzburg, of Styria, of Carinthia, of Carniola and of the Bukovina, Grand Prince of Transylvania, Margrave in Moravia, Duke of Upper and Lower Silesia, of Modena, Parma, Piacenza and Guastalla, of Auschwitz and Zator, of Teschen, Friuli, Ragusa and Zara, Princely Count of Habsburg and Tyrol, of Kyburg, Gorizia and Gradisca,
Prince of Trent and Brixen, Margrave of Upper and Lower Lusatia and in Istria, Count of Hohenems, Feldkirch, Bregenz, Sonnenberg, and so forth,
Lord of Trieste, of Cattaro and of the Windic March, Grand Voivode of the Voivodship of Serbia, Sovereign of the Order of the Golden Fleece.

[The United Counties of America]

By the order of the American Commonwealth Act of 1810, there are two monarchs reigning as co-heads of state. The monarch of the British Empire reigns as the sovereign leader while an American monarch serves as a vassal of sorts. These are their titles.

Her Royal Majesty, Elizabeth the Second, by the Grace of God, of Great Britain, Ireland, Brittany, The Netherlands, and of the British Dominions beyond the Seas, and of the American Commonwealth, Queen, Defender of the Faith, Empress of India

Her Royal Highness, Matilda the Third, of the Commonwealth of The United Counties of America, and of the Indigenous Tribes, Nations, and Peoples within, Queen, Servant of the People, Duchess of New West Wales

[Kandorith]

The full title of the head of state of Kandorith is currently:

Her Imperial Highness, The Empress, Empress Masumi, Masumi of Ashikaga. Though the title is mostly shortened to Her Imperial Highness Masumi or The Reigning Empress, Masumi.

The head of government's full title is His excellency, The Prime Minister

[Haviland]

Flowery titles are regarded as pretentious and vestiges of monarchy.

The head of state is simply known as "President."

[Saint Arsenio]

The King is usually referred to as: His Majesty, King Macio Glennwood of Saint Arsenio

[Alba and Cymru]

While most heads of state are referred to simply as "King", "Queen", "President", etc, they usually also have a long ceremonial title. For example, Queen Elizabeth II has her full title as "Elizabeth II, by the Grace of God, of the United Kingdom of Great Britain and Northern Ireland and of her other realms and territories Queen, Head of the Commonwealth, Defender of the Faith".

What is your head of state's full title? Ours is "Mr. Matthew, by the Mandate of the People, the President of the Federal Republic of Nacrad, the Grand Marshal and Commander-in-Chief of the Armed Forces of the Federal Republic of Nacrad, the Leader of the Federal Republic and her Dependant Terrirories"

We always use "[...] her Dependant Territories" regardless of if the President is male or female, as the dependant territories belong to Nacrad, which is designated a feminine pronoun, instead of the President.

Informal:
King Cynbal IV of MacGregor

Formal:
His Majesty Cynbal IV, anointed Supreme Druid by the power of Dagda, High Chief of the Royal Army, Lord of Glasgow, and crowned King of the United Kingdom of Alba and Cymru and other realms, Protector of the People, of the House of Clan Gregor.

[Toropikaru]

Her informal title is Empress Minako Kazena of Ai'yeong'ji. Her full title is Her Highness, Empress Minako Kazena of the Land of the Golden Flower. In Karunese, her informal title is written as 皇后'で'미나코'風南'の'愛榮寺 and her formal title is 카이'女,皇后'で'미나코'風南'の'하크리'で'그리'の'国 (romanized informal: Jikai'jei de Minako Kazena no Ai'yeong'ji) (Romanized formal: Kai'shou, Jikai'jei de Minako Kazena no Hakeuri de Geuri no Yuu)

[Bazant]

First Administrator of Bazant

[The Great British Nation]

Sir Neville Walpole, by the Mandate of the People, the First Secretary of the Kingdom of the Great British Nation, and Head of Government of the Kingdom and her Dependent Territories

[New Lunenburg]

Royal title:
Her Majesty Elizabeth the Second, by the Grace of God of the United Kingdom, New Lunenburg and of Her other Realms and Territories Queen, Head of the Commonwealth, Defender of the Faith

Viceregal title:
His Excellency the Right Honourable Sir William Fitzallen, Governor General of New Lunenburg

[Asharidin]

Short:
His excellency,The As - Sultan of Asharidin,Muhammad Al - Bashirid
Long:
His excellency,The as - sultan of Asharid,The fair,True Heir of the monarchy,The Dear,Ruler of the Great Country,Muhammad Al - Bashirid.
The one he likes:
Mr.Hammad/Mr.Muhammad

[Kedri]

The head of state of the Confederation actually has no official title, but "President" is the most commonly used term. If one needs to be formal, then simply "Mr./Ms./Mrs." and "sir/ma'am" will suffice."

[Anollasia]

The Prime Minister of the Peaceful Republic of Anollasia

Alternatively: Huzurlu Anolasya Cumhuriyeti Başbakanı (Turkish) or Bime Bakister ıof ohe Bareaceful Cumhurlic iof Anolasia (Anollasian)