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Playstation 2 - Inuyasha: Feudal Combat cheats

Complete the following chapters in Story mode to unlock the following 
chapters:

Unlock Miroku's Chapter: Finish Inuyasha's Chapter
Unlock Sesshomaru's Chapter: Finish Miroku's Chapter
Unlock Shippo's Chapter: Finish Sesshomaru's Chapter

Unlockable characters:
Complete the following chapters in Story mode without using a single 
continues to unlock playable characters:

Unlock Bankotsu: Finish Miroku's Chapter 
Unlock Demon Inuyasha: Finish Sesshomaru's Chapter
Unlock Human Inuyasha: Finish Shippo's Chapter
Unlock Naraku: Finish Inuyasha's Chapter

Unlock Naraku's Castle
Finish Mission mode

Unlock Challenging mode
Finish Mission mode with 3 different characters

Team attacks:
Press X + Square. 

Team combo special:
Press Circle after you have leveled up twice.