Separatysme

Persona 4

Overnight Grinding
There are two "sections" to dungeon 7. In the 2nd section's first floor there is a rare shadow in the form of Mustache King. Equip a Reflect Phys persona and find him. While fighting him. Let your allies die and simply go into auto mode. As the king summons and they kill themselves by attacking you, you can rack up the XP overnight. Revive your allies in the morning and finish off the king.
Submitted By Sefiraat

Secret Weapons
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.
Submitted By feather

Ultimate Weapons
Ultimate Weapons - Defeat Death to unlock the ultimate weapons.

Play the game all the way through and start a new game plus, and Death will appear in random treasure chests. If Death is inside of a chest it will prompt you when you go to open it.
Submitted By feather
Persona 4 Unlockables

Izanagi-no-Okami
After completing the game with the true ending and starting a New Game+, a new fusion section will unlock and you'll be able to fuse Izanagi-no-Okami.
Submitted By Person

New Game Plus
New Game + - Finish the game once.
In New Game + a new fusion section becomes available allowing you to fuse Izanagi-no-Okami.

    God Judgment - Fuse a persona during the fusion forecast "Skill Change." (Halves enemy HP / Light)
    Hell Judgment - Fuse a persona during the fusion forecast "Skill Change." (Halves enemy HP / Dark) Dark.

Metal Bat
After reaching 19 Social Links, visit the Velvet Room and Margaret will award you the Metal Bat.

find the reaper
To find the Reaper, head to Magatsu Inaba (during your second playthrough) and open the regular treasure chests. It should show up here.
Submitted by:IGN_Cheats
Defeat Gold-Handed Enemies with Ease

Using attacks that inflict multiple damage (like Torrent Shot or Kill Rush) are very effective on gold-hand enemies. These shadows are easy to knock down, and are overwhelmed by these attacks. This will not work on the Luxury Hand due to its physical damage defense.

arcana Card Effects
Below is a list of effects for all of the Arcana Cards, both “up” and “down.” Note: all stat increases and Skill and Persona changes are permanent and only affect your personas.

    Fool - Random effects
    Magician

    - Up: levels a attack or spell to next level / Down: levels down an ability
    Priestess

    - Up: shows data for enemy in battle / Down: hides data about enemies
    Empress

    - Up: heals all HP / Down: brings it to one
    Emperor

    - Up: easier player advantages in battle / Down: easier enemy advantage in battle
    Hero

    - Up: negative effect of next card nullified / Down: more chance of neg...