This guide is a work in progress, and will be updated as new and accurate information comes to light.

The classes labeled as "unlocked from the beginning" are the classes that are available as soon as you unlock the ability to adjust your retinue after completing the quest "The Goblins' Raid".

Concerning the "usual specialties": These specialties are not set in stone, and are based on the first individual of that class when it is initially unlocked. Each class has a list of individuals, some of which can have different weapon and spell specialties than the ones listed in the table. Another thing to note is that once you select a class to be Emperor, then the Emperor's skill levels at the time will be carried over for all subsequent non-Emperors of that class after a time skip (they will not carry over if they die or abdicate).

This quest can be completed in two ways:

1. Defeat the Gel Matter in the Fiends' Cloister, then report back to Master Dragon in the Dragon Lair
   
2. Defeat the Crawlers further inside the Fiends' Cloister, then defeat Master Dragon in a duel

Option 1 is the easier outcome, and will unlock Martial Artist immediately.
Option 2 will complete the quest, but Martial Artist will not be available. The only way to unlock Martial Artist at this point is to make a Martial Artist the Emperor. This can only be done via a time skip or the death of the Emperor, not abdication.

"A Problem of Succession" becomes available after completing "Liberating the Canal Fortress". If you have a time skip, die, abdicate, or leave Cumberland during any of the choice prompts in this quest, the quest will fail, and the follow-up quest "The Fall of Cumberland" will become available.

"Searching for the Mermaid" can only be completed with a male Emperor, and the quest officially begins when you watch the dancer's first performance. If you have a time skip, die, or abdicate after this point, it will fail, and you will be locked out of unlocking Dancer for the current playthrough. If you complete this quest as the Final Emperor, the game will end and you will be returned to the title screen.

If you skip/fail "Searching for the Mermaid", it is still possible to unlock Nereid by collecting the ingredients for the Mermaid Potion during the quest "The Storm and the Sunken Sea".

(Unconfirmed) If you do not create your own Mermaid Potion, and you are instead given one by the fishman who enters the throne room, you might be locked out of unlocking Nereid for the current playthrough.

To force the corsairs to join the Empire, you must either:

1. Take the land route through Cape Chalier
   
2. Fight the corsair crew in Mobelm and steal their ship to pass through the Waterway Maze

This will unlock the Corsair class early, but once the "Garon's Rebellion" quest begins, Corsair will become temporarily unavailable until this quest is completed.

This quest is unlocked by speaking to the bartender in Yuyan after the Mole Den is repopulated. You will be unable to speak to the bartender if you have progressed the main quest in Yauda to the point where the Floating Castle appears and is floating over Yuyan. In that event, you must either:

1. Wait for a time skip so the Floating Castle will move to a location other than Yuyan
   
2. Complete the main Yauda quest by defeating Wagnas (reach the Floating Castle using Hiraga's machine)

You can only complete one of these two quests per playthrough. Completing "The Volcano's Eruption" will unlock the Salamander class. If you have a time skip, die, or abdicate before destroying the rock on top of Mt. Comroon, the quest will fail and the volcano will erupt.

If the volcano erupts, a new location, the Sunken Island, will appear. After completing this dungeon and defeating the Sorcerer, your current Emperor will be forced to abdicate. You can then go to Tsukijima and speak to Seimei to finish "Tsukijima's Grimoire of Eld" and unlock the Diviner class.

Each class has a formation that can be unlocked when you make them the Emperor. Classes with both male and female versions (i.e. Light Infantry, Freelance Mage, etc.) share the same formation, so it's only necessary to make one version the Emperor to unlock the formation.