Alternate costumes
Successfully complete the game in Musou mode with any character. Alternate costumes for all characters that belong to the same side will be unlocked. Highlight a person at the character selection screen, then press L2 or R2 to select a new color.
Flashing question mark
You may see a small purple flashing question mark in the lower right corner of the screen. In order to complete it, you must create 120,000 Perfect combos or make 999,999 combo in game points. Once you make it one fourth of the way, you will get a purple to yellow question mark. Once you are halfway there, you will get a red question mark. Once you get the full amount, you will receive the Musuo Armor, which allows you to get hit by an arrow and just get the damage without losing your footing.
Where to get 5th weapons, (for the basic people only)
If you are willing to get the 5th weapons but don't know how, make sure you have the level on very hard these are the people who I know:
Lu Bu
Stage:Chi Bi
Method:Make your morale big then i think
Dong Zhuo will send back-up troops from the level at chang ban defeat them, special item report.
Diao Chan
Stage:Diao Chans 1000 journey (new stage?)
Method:Defeat Lu Bu's back up troops and the general himself, special item report.
Yuan Shao
Stage: Hu Lao Gate
Method: Defeat Diao Chan, Lu Bu will get pissed off at you special item report.