Play as Testament:
     Go  up to level 20 in survivor mode and you will fight Testament.
Beat him and you can play as him.

Play as Dizzy:
     Go up to level 30 in survivor mode and you will fight Dizzy. Beat
her and you can play as her.

Guilty Gear mode:
     Beat  arcade mode with all characters to unlock Guilty Gear mode.
You can also go up to level 100 in survivor mode to unlock this mode.

View character's ending:
     To view their ending, beat arcade mode with any character without
using continues.

Alternate costume colors:
     When  selecting  your  character,  highlight  a  person and press
Select to use his fifth costume; A + X to use their sixth costume; and
B + Y to use their seventh costume.