Shin Megami Tensei: Persona 4 Cheats - PlayStation 2
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New Game +
Go through the main game once to unlock New Game Plus.
Secret Weapons
By returning to completed dungeons, you can find the characters' secret weapons. Note: No secret weapon available for Chie.
Kanji's secret weapon - Defeat extra boss in Steamy Bath House.
Kuma's secret weapon - Defeat extra boss in Opera House.
Main Character's secret weapon - Defeat extra boss in Void Quest.
Naoto's secret weapon - Defeat extra boss in Secret Lab.
Yousuke's secret weapon - Find in boss' den in Mysterious Shopping Street.
Yukiko's secret weapon - Defeat extra boss in Yukiko's Castle.
Ultimate Weapons
Available only in a 2nd playthrough or more, Death will sometimes hide within treasure chests. Chests containing Death will prompt you to pick between the choices to open or ignore the chest. If you choose to open the chest, you will have to fight Death, which when defeated, will drop the ultimate weapons for the characters.
Judgements
God Judgement - Fuse a persona during the fusion forecast "Skill Change", Light.
Hell Judgement - Fuse a persona during the fusion forecast "Skill Change", Dark.
Finding the Reaper
Go to Magatsu Inaba in 2nd playthrough and open the regular treasure chests there (not the golden ones), easier to find in Magatsu Inaba.