Every character
Just have a saved game file from Samurai Warriors on your memory card to start with every character available.

In-game reset
Hold Start + Select while playing.

Hints & Tips

Green cursors
Having a green cursor around your character at the character select screen means that character is a "lucky" character. These characters can receive there fifth and sixth level weapons one difficulty below the normal setting. Note: Each time the game is turned off and started again, the cursor will change to another character.

Fight against Lu Bu
Reach floor 30 in the Abyss in survivor mode. Lu Bu may also challenge you if you go beyond a certain amount of gold in Gold Rush when your in survivor mode.

Shield Wall
Just play the Battle Of Komaki-Nagakute as Honda Tadakatsu. Win every mission, then beat the supply team when it appears.

Alternate Musou attack
When your Musou meter is completely full, press Circle to start the attack. Then. release Circle and press Square swiftly. Your character will stop their normal Musou attack and hit the enemies with a stronger versions of their charge attacks. This is useful with characters like Nobunaga, that have unreliable Musou attacks that only work against large groups.

Alternate costumes
Finish the game to access that character's alternate costume.

War Baton
Simply play any versus mode option at least 35 times.

Tadakatsu Honda: Fifth level weapon
When your in story mode on his third mission, take out Oyamada to finish the first objective. This will have Ieyasu go into the crane formation. Now Shingen will order the Takeda cavalry to charge. Do not kill even one of the cavalry generals. Allow the cavalry to crush the crane formation. This will cause Ieyasu to retreat, but Tadakatsu will decide to kill Shingen himself. After two or three minutes, a supply unit will appear at the lower right gate and move north. Now kill the unit to get Tadakatsu's fifth level weapon, Arahabaki.