Final Fantasy Tactics: The War of The Lions Cheats

Unlocking the secret characters
There are five secret characters that can be attained in the game, six if you count the two forms of Reis. The following list shows how to get them all. NOTE: You must have Mustadio in your party to get all of the secret characters, and all of these characters are aquired in Chapter 4.

Beowulf: Read the rumors at Goland, go to Lesalia, then agree to accompany Beowulf to Goland. After a series of plot battles, he joins the party.
Biblos: Aquired after clearing all ten levels of the Deep Dungeon.
Cloud: After returning Reis to human form, go to Goug. Cloud will run off to Zarghidas after a scene. After clearing Igros, go to Zargidas and win the fight.
Dragon Reis: Accompany Beowulf through Goland Coal City; Reis is rescued during the final battle in the series.
Human Reis: Read the rumors at Zeltennia, buy a flower in Zarghidas, then return to Goug. This unlocks a battle in Zeltennia, and Reis takes human form afterward.
Worker 8: After rescuing Reis from Goland, return to Goug Machine City. Worker 8 joins the party after a small scene.

Hidden Sound Test
When starting a new game, enter your name as PolkaPolka and you will be taken to a sound test menu (tested on US version).

Secret Characters
There are 7 secret characters in the game that are not met during the normal course of the storyline. The following must be done in order to obtain these characters.

Also, you must be in Ch. 4 before starting this, and Mustadio must be in your party.

Balthier: After Bervenia, read the "Rash of Thefts" rumor in Gollund and "Call of Guards" at Dorter. Try to move and you will enter a battle. Win this battle.
Beowulf: Go to Goug. Read the rumor at Gollund, go to Lesalia, then invite Beowulf to Gollund. After a series of battles, he joins the party.
Cloud: Visit Goug After Zeltennia. After returning Reis to human form, return to Goug. Then go to Sal Ghidos and win the fight.
Construct 8: After rescuing Reis from Gollund, return to Goug.
Dragon Reis: Accompany Beowulf through Gollund; Reis is rescued during the final battle in the series.
Human Reis: Read the rumors at Zeltennia, buy a flower in Sal Ghidos, then go to Goug. This unlocks a battle in Nelveska Temple. Win this.
The Byblos: Acquired after clearing all ten levels of Midlight's Deep.

Unlockable Second Battle at Lionel Castle
To unlock a second battle at Lionel Castle, you must have Beowulf and Human Reis in your active party. When you return to Lionel Castle, a cutscene will play. Aliste Rosenheim will appear and kidnap Reis. Then, the battle will ensue. Win this battle, fight Celebrent Bredmondt, and you will get Reis back after you're victorious.

Friendly Fire
During random battles (not story-driven battles), getting experience and JP are vital to the growth of your characters. Since enemies in random battles can almost always be handled rather easily by your party (as they grow with the strength of your party), you can eliminate all but one member of the enemy party rather easily. Leaving that enemy alive, you should then have your characters attack one another, healing with Chemist skills and White Magic if you can, until you can no longer survive without killing off your party. Then, go after the final enemy and eliminate it to finish the battle. By doing this, you can create experience and JP you wouldn't have gotten in the battle otherwise, lessening the amount of random battles you'll have to fight to build your characters' levels.

Friendly Fire & Chocobo
If you have a Chocobo in your party, you'll no doubt know that they have Choco Cure, a useful skill that can be used over and over again. Choco Cure restores some of the Chocobo's HP, as well as characters in front of it, behind it, and to the left and right of it. If you try executing the hint entitled "Friendly Fire", having a Chocobo in your party to heal characters grouped together each round will allow you to survive the fight even longer, building experience and JP levels even higher.