Have Mustadio in Chapter four. After Bervenia, go to the mining town of Gollund. At the tavern, read the "Rash of Thefts" rumor. Go to the merchant city of Dorter. At the tavern, read the "A Call for Guards" rumor. When you leave the city a battle will start. Win the battle with Balthier's help and he will join you.
Beowulf
Have Mustadio in Chapter four. Go to Goug. Read the rumor at Gollund. Go to Lesalia. Invite Beowulf to Gollund. He will join your group after a series of battles.
Character jobs
Reach the indicated job level to unlock the next job in that class.
Job
How to unlock
Archer
Reach level 2 Squire.
Arithmetician
Reach level 5 White Mage, level 5 Black Mage, level 4 Mystic and level 4 Time Mage.
Bard
Reach level 5 Summoner and level 5 Orator; only as a male character.
Black Mage
Reach level 2 Chemist.
Dancer
Reach level 5 Dragoon and level 5 Geomancer; only as a female character.
Dark Knight
Completely Master Knight and Black Mage, crystallize 20 units, and reach level 8 with Dragoon, Ninja, Goemancer and Samurai.
Have Mustadio in Chapter four. Go to Goug After Zeltennia. Return Reis to human form, then go back to Goug. Go to Sal Ghidos and win the battle.
Construct 8
Have Mustadio in Chapter four. After rescuing Reis from Gollund, return to Goug. Construct 8 will join your party after an intermission sequence.
Dragon Reis
Have Mustadio in Chapter four. Accompany Beowulf through Gollund. Reis will be rescued during the final battle in the series.
Human Reis
Have Mustadio in Chapter four. Read the rumors at Zeltennia, buy a flower in Sal Ghidos, then go to Goug. Go to Nelveska Temple and win the battle. Reis will turn into human form afterwards.
Lip-Rouge
Keep Lavian and Alicia (Agrias' guards from Chapter 1) in your party in Chapter four. Land on a City on Cancer I and have at least 500,000 gil. After the intermission sequence featuring Mustadio giving a birthday gift to Agrias, you will have the Lip-Rouge, which boosts the stats of female characters.
Luso
During Chapter 3, go to the Zekalus Desert after the Orbonne Monastary battles. After the intermission sequence, win the battle.
Raising a person's bravery
If you use Ramza's Steel ability on someone in battle, it raises their bravery by 5 points. After the battle, notice that the person's bravery permanently stays increased by one with each fight you use it on them.
Rare items
Poach the indicated monster to have a chance of obtaining the corresponding rare item.
Item
Monster
Cachusha
Pig
Cherche
Behemoth King
Dragon's Whisker
Red Dragon
Elixir
Red Chocobo
Holy Mace
Sekhret
Omnilex
Great Malboro
Zwill Straightblade
Vampire Cat
Sound Test
Start a New Game and enter 'PolkaPolka' (without quotes) as the main character's name. Make sure there are no trailing spaces and to respect the capital letters in the name.
The Byblos
Have Mustadio in Chapter four. Complete all ten levels of Midlight's Deep.
Balthier...