Enter the codes below when the Options are sliding across the title screen:

Play as Uranus & Master:
1.On Controller 1 press R1, L2, X, L1, R2, O. This will turn the cursor blue (it is normally yellow)
2.Let the demo start (you don't have to watch it)
3.When the title screen appears again, enter O, R2, L1, X, L2, R1 on Controller 2

Play as Vermillion & Sho Shinjo:
1.Defeat the 1-player game on Level 5 Or...
1.At the Title Screen press L1+L2+R1+R2+Triangle+Square on Control Pad 1
2.On Control Pad 2 do the exact same thing.
3.To use them go to the Question Mark box, press and hold Select till they cycle slowly
4.Press X on the one you want.

Remove Meters
1.Pause the game during a match
2.Press and hold O, T, S, X and press "Select" twice

Last Boss:
At the Title screen press up, down, up, down, up + triangle.