Formal title of your nation's leader?

[Norstien]

Monarch: By the grace of god, Protector of the land, His Majesty King Edvard VII of Norstien

Head Councilman: The Right Honorable, Insert Name, Head Councilman

[Free Arctic Territories]

Director of the Board of Trustees of the Free Arctic Territories Green Districts.

[Bearstin]

Supreme Marshal of the Bearstinian Military, Protectorate of Bearstin, and ruler of the Coytians, His Excellency Emperor Darius of House Black

[The Etheri]

High Prince of the Etheri, Lord of Vrool, Xall, and Etheria, His Great Majesty, [Any additional titles], [Name]
For short, HPELVXEGM, even shorter, High Prince.

[Alinghi Federal-Democratic Republic]

The formal and full Head of States title is

The Chancellor, representant of Alingan people and cantons, President of the Republic of Muntipauna, and leader of Alingo-Muntipaunian Commonwealth and special administrator of Marie Byrd Land Special Centralized Administrated Territory.

Called simply Chancellor (or President in Muntipauna)

[Ordocravia]

Tradehßar ẞhafumparetor gras Ordocravniæs
Gracious-Almighty Imperator of The Ordocravianites

[Shefkland]

Chairman of the Presidium and General Secretary of the Communist Party. Usually addressed simply as comrade.

[Haldenstahl Endenfantal]

Holiest Democratically Elected Omnipotent Archpriest
Or, HDEOA for short.

[Dawetid]

Currently: President
Formerly: President cum Head of State of the Republic

[Iron Alliance of America]

Dean McCannon is both formally and informally referred to as Supreme Generalissimo.
This is said to be easier than the actual title:
"Supreme Guiding Overlord Major Field Marshal of the Land/Air Forces and Ultimate Commander of the Iron Alliance of America".
It's also said to be a bit more polite than:
"Mister Dean".

[Prumia]

The Grand Consul of the Republic, often with an added appellation such as "Esteemed" and "Honored".

[Akaran Islands]

Akaran: Arvos eō sõi Akarav Siōti, Esos eō sõi Tenmeni Yanin, yge Veya eō Seoshi Votï
English: Emperor of the Akaran Islands, King of the Tenmeni People, and Protector of West Africa

[Lux Pulchrae]

His Majesty was formerly Crown Prince, Heir to the throne

[Pelotas]

President (English): His Excellency Amado Lauwers, President of the Federal Republic of Pelotas
Prime Minister (English): Her Excellency Lia Oleastro, Prime Minister of the Federal Republic of Pelotas, Member of the Federal Diet for Capoeiras, Minister of Science and Technology
President (Portuguese): Sua Excelência Amado Lauwers, Presidente da República Federal de Pelotas
Prime Minister (Portuguese): Sua Excelência Lia Oleastro, Primeiro Ministro da República Federal de Pelotas, Membro da Dieta Federal para Capoeiras, Ministro da Ciência e Tecnologia
President (German): Seine Exzellenz Amado Lauwers, Präsident der Bundesrepublik Pelotas
Prime Minister (German): Ihre Exzellenz Lia Oleastro, Ministerpräsidentin der Bundesrepublik Pelotas, Mitglied des Bundestag für Capoeiras, Ministerin für Wissenschaft und Technologie

[Toin]

King. That's about it. While he does serve as head of state of colonies and nations part of the Toinan Commonwealth, his only title is King.

(colonies/puppets referenced: Motra, Acterland, Jampired)

[Grossteutschland]

Imperial President of Grossdeutschland

Reichspräsident von Grossdeutschland / Grossdeutscher Reichspräsident

[Zhouran]

Although the People's Republic of Zhouran is a stratocracy, the President of the State Presidium is officially referred to by the name of their position (President Kang Yingyong), although foreign media would use the name of their current military rank instead (Senior Marshal Kang Yingyong) in order to solidify the militaristic image of the country and its warior culture.

[The Republic of Christiandom]

Varies depending on the most powerful organization.
Ecclesiarch/Field Marshall(Or Lord Solar)(Or Lord General)(Or Warmaster)/Lord Inquisitor/Lord Commissar

[Canada Dominion]

His Excellency the Right Honourable _________, Viceroy and Governor General of Canada

[Xuyang]

President.

[Carena]

His Excellency, President ________ of the Confederacy of Carena

However, many opt to go by the simple Mr. President

[The Black Party]

Minister of (Insert Ministry here).
Overseer of State Police.
TBP is run by several Ministry's (And the Secret Police), which all have one leading Minister (Overseer for the State Police).

[Otira]

His Imperial Majesty, the the Emperor of the Otiran Republic and Defender of the Faith.

[Artoonia]

Per la Graco Dia, Lia plej serena, iluminata Imperiamajesteco Imperiestro (name) de l'Imperio Artunia kaj Ŝia Regnoj Dominataj, Ĉefa Vulpa, Granda Admiralo de la sep Maroj, Marŝalo de la Kampoj kaj Ĉieloj, Cezarego de la Tria Romo, Fida Defendisto, Patro de l'Artuana Raso, Frato de ĉiuj Liberuloj

By the Grace of God, His most serene, enlightened Imperial Majesty Emperor (name) of the Artoonian Empire and Her Dominion Realms, Chief of the Clan Vulpo, Grand Admiral of the seven Seas, Marshal of the Fields and Skies, Grand Cæsar of the Third Rome, Defender of the Faith, Father of the Artoonian Race, Brother of all Freemen

The "Ĉefa Vulpa" part is not a Constitutional title, but so long as the House of Vulpo retains the Imperial Throne, passes along with the same inheritance rules, except that if a woman were Empress,the Clan Chieftancy would have to pass to her eldest brother, uncle, or other male relative.

"Granda Admiralo de la sep Maroj, Marŝalo de la Kampoj kaj Ĉieloj" refers to his position as Commander-in-Chief of the Imperial Defence Forces.

"Cezarego de la Tria Romo, Fida Defendisto" refers to his position as the Bishop of Muzino and head of the Church of Artoonia. Since the COA does not ordain women, it is unknown at this time how it would be maintained during the reign of an Empress.

"Patro de l'Artuana Raso, Frato de ĉiuj Liberuloj" refers to the cultural union of the former tribes that now comprise the Empire, which were at war for centuries until a mixed-breed Emperor brought them all together. It is presumed an Empress would the feminine versions here.

[Milintia]

Robert Barret, President of the Milintian Council, Representative of the Will of the Milintian People, Chief Servant of the Civil Service, First Minister of the Milintian Cabinet.