PS2 Samurai Warriors Cheats

Magoichi: Clear any campaign:
Masamune: Clear any two campaigns
Shingen: Clear Sanada's campaign
Kunoichi: Clear Hanzo Hattori's and Shingen's stories
Keichi Maeda: Clear Kenshin Uesugi's story
Okuni: Clear Keiji Maeda's story
Goemon: Clear Okuni's story
Ranmaru Mori: Clear Mitsuhide Akechi's story
Noh: Clear Ranmaru Mori's story
Nobunaga Oda: Clear Oichi's, Magoichi's, and Noh's stories

Unlockable: Second Costume:
Finish an officer's Story Mode campaign to unlock their second costume. This can be either the "good" ending or the "bad" ending. Press CIRCLE while selecting your officer for a session to toggle the second costume.

Hint: Sanada Yukimuru's 5th weapon:
Stage: Summer Campaign at Osaka Castle. Method: Complete all missions without failing, then get a 1000 K.O. count message. A supply team will appear by the south west gate and head towards the middle gate. Defeat the captain and you shall have the weapon.