Unlock Naraku's Castle Stage
Clear Story Mode including the final missions. The best pair to beat mission
mode with is Bankotsu and Demon Inuyasha.

Unlock Sesshomarus Story
Complete Miroku/Sango's story to unlock Sesshomaru's story.

Unlock Training Stage
Destroy all the pillars in training with every character except the crocodile.

Fight Around Black Pearl
You can only fight around Black Pearl using Sesshomaru or Koga only -- the other
characters cannot do this. Your oppenent must be on the edge of the battle field
of Black Pearl before you jump down from the battle field. After the bird drops
you back into the arena, jump up and use a fast attack (default on the X key)
and you should land outside the Black Pearl. Have fun fighting and watchout for
holes.

Unlockable: Miroku/Sango's Chapter
Complete Story mode with Inuyasha.

Unlock Extra Stage
In the part of the menu where you can pick a level to play on there is a
selection right before the ??? choice (or the random choice) that cannot be
selected by default. Clear mission mode to unlock this stage.

Unlock Shippos Story
Clear Sesshomaru's story to access Shippos story.

Unlock Extra Characters
Naraku: Complete Inuyasha's Chapter in Story Mode without using any continues.

Banokutsu: Complete Miroku's Chapter in Story Mode without using any continues.

Demon Inuyasha: Complete Sesshomaru's Chapter in Story Mode without using any
continues.

Human Inuyasha: Complete Shippo's Chapter in Story Mode without using any
continues.

Defeat Demon Inuyasha Easily
The easiest way to beat Demon Inuyasha with Sesshomaru is to get his hp lower
than yours (try to use the miasma to your advantage by always running around it
but makin him run through it)then for the rest of the match run away from (just
run in big circles) and make sure you don't get hit(try to have a big gap
between your health and his just in case you get hit my him or miasma) trust me
this is the easiest way to beat him and best of all it only takes a minute and
while using this tip you get to see how cool Sesshomaru is

Double/Chained Special Attacks
Attack the opponent to accrue special energy. When your character is red, spirit
power is unlimited for a brief period of time, making it possible to rapidly
unleash some special attacks in quick succession.