Secret Message
If you hold the R1 button before the title screen appears, you should hear a secret message in japanese after the name of the game is spoken. The secret message will be different depending on which character announces the title.

Unlock all characters except Totosai
Enter this code at the meun screen:
up, right, down, left, up, right, down, left

Classic Inuyasha Pictures During Supers
Enter code at title screen:
Up, Up, Down, Down, Left, Left, Right, Right

Classic Inuyasha Pictures During Supers
Enter code at title screen.
Up, Up, Down, Down, Left, Left, RIght, Right

Alternate character portraits during Super SP Moves
To see an alternate character portrait when a Super SP Move
connects with an opponent, do it when your life bar is at it's yellow stage. Useful for unlocking certain pictures

Watch the Game Credits
After unlocking all the characters in ''Feudal Fairy Tale'' mode, play the last unlocked character and complete the game to view the credits rolling with Shippo giving you "Thank you" comments.

Unlockable Characters
If specified, enter the code at the main screen.

7 Totosai
After clearing "Story" mode with every character, beat all the current records for each mini-game in "Backpack" mode to unlock Totosai. He will then be playable in all gameplay modes.

7 Koga
Beat the game with InuYasha.

7 Miroku
Beat the game with Kagome.

7 Sesshomaru
Beat the game with Kagura.

7 Kagura
Beat the game with Koga.

7 Sango
Beat the game with Miroku.

7 Shippo
Beat the game with Sango.

7 Naraku
Beat the game with Sesshomaru.

7 Kikyo
Beat the game with Shippo.

7 Totosai
Up, Up, Down, Down, Left, Left, Right, Right, Up, Left, Down, Right, Up, Left, Down, Right

7 Demon InuYasha
Up, Up, L1, L1, Down, Down, R1, R1

7 Demon InuYasha
Using Totosai, complete story mode and collect all the shards, as many as are listed in Myoga's secret room. Doing everything perfect is not a requirement