Alternate costumes
Successfully complete the game and save. Choose to start a new game and a "Shinnosuke Normal/Special" option will be available. The special version will put Samanosuke in a Panda costume with a baby panda in a front pocket clapping his hands. The Panda suit will be shown in most short clips but not all FMV sequences.

Onimusha 2 FMV sequence
Successfully complete the game and save. Choose to start a new game and a "Special Report" option will be available. This allows a small sequence from the game's sequel to be viewed.

Speed trail mini-game
Collect all 20 Fluorites (blue rocks) in the game. Complete and save the game. A new speed trail mini-game will be unlocked.

Bishamon O Flute
There are two places in there game where a very strange man hanging from the ceiling by his feet, stares at you and ignores you. Later in the game, after you use the Evil Plate and open the door, he will talk to you. The man will now take you (whenever desired), to the Dark Realm. In the Dark Realm, killing monsters until two portals open; one to go up and one to go down. Keep going down to the last level (20th) while collecting all the items in route. There will be no monsters to kill on the last level. Open the box to get the Bishamon O flute. Keep the flute just before the last fight with the Demon King.

Bishamon Sword
In the Demon Realm (just after you destroy the Ultimate Creation) is a save mirror and three doors. Go to the door that resembles an iron gate. It will not open at first. Use the Bishimon O flute on it and enter. Go to the Bishimon Sword jutting out of the Skull Demon wall object and take it. It is more powerful than all three of your weapons put together, and it has speed. The sword also has an unlimited supply of magic.

Character change
To get the character change you will need to pick up 10 pieces of fluorite.

Oni Spirits Orb locations
Thunder orb stage 2,
Fire orb stage 4,
and the Wind orb is on stage 7.

New mode
If you can finish all 12 levels on the mini game Oni Spirits, you will unlock a new mode. Choose this mode to start the game with the following equipment, The Bishamon sword, 99 soul absorbers, infinite normal arrows and infinite matchlock bullets.

Final score
You are awarded a final score after finishing onimusha. If you have 30 points, you will receive S class, in which Kaede will have a new costume. 25-29 points will net you an A rating. For 18-24 points you will receive a B rating. 10-17 points will give you a C rating. And for 0-9 points you will receive a D rating. You are scored on how many demons you killed, how many souls you collected, how many pieces of fluorite you picked up and your play time.