Have a saved game file from Samurai Warriors on your memory card to start with all characters unlocked.
Alternate Musou Attack
When your Musou meter is full, press Circle to begin the attack. Then. release Circle and press Square rapidly. Your character will stop their regular Musou attack and hit the enemies with stronger versions of their charge attacks. This is especially useful with characters such as Nobunaga, that have erratic Musou attacks that only work against large groups.
Book of Healing
In Inahime's Osaka Summer Campaign, begin the map by defeating Takigawa Kazumasu, then defeat Kunoichi before she heads in the ninja path.
Fight Lu Bu
In the survival Gold Rush mode, if you get a huge amount of gold, Lu Bu will challenge you when you try to leave the training hall.
Golden Rune
Gather 50,000 Gold Units in Gold Rush mode and buy the item.
Green Cursors
A green cursor around your character at the character select screen indicates that specific character is a 'lucky' character. These characters can receive there fifth and sixth level weapons one difficulty below the supposed setting.
Every time the game is turned off and restarted, the cursor will randomly change to another character.
In-game Reset
Hold Start + Select during game play.
Ninja Suit
In Hashiba Hideyoshi's Siege at Azuchi Castle, during the third floor of the castle part, defeat the 5 'wrong general' before defeating the real one.
Shield Wall
Play the Battle Of Komaki-Nagakute as Honda Tadakatsu. Win all the missions, then defeat the supply team when it appears.
The Kage Scroll
In Imagawa Yoshimoto's Challenge at Honnouji (Lower path), defeat every Uesugi officiers, then Nobunaga, then win a deadlock against Uesugi Kenshin.
All Characters...