Shin Megami Tensei: Persona 4 Hints

New Game +

Go through the main game once to unlock New Game Plus

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

Unlock 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 one of the best Personas in the game