There is easy trick to unlock all the characters in Dynasty Warriors 7 Special, which is a PSP port of Dynasty Warriors 7. It is only for those who already have Dynasty Warriors 7 on Playstation 3, else they won’t be able to use this trick, since it requires you to have save files of Dynasty Warriors 7.
Put data from the Playstation 3 version of the game on your Memory Stick and all of the characters in Dynasty Warriors 7 Special will be unlocked from the very beginning.
Dynasty Warriors 7 Special comes out on August 25 in Japan and will feature support for two players in chronicle as well as story mode for cooperative play. It also features a four player mode, which puts you against your friends to prove your mantle.