Highlight the "Arcade" option at the main menu, then hold L and press X. You will now face Gold characters as well as Robo Ky, Kliff, and Justice.
Alternate M.O.M. mode
Highlight the "M.O.M." option at the main menu, then hold L and press X. You will now face Gold characters as well as Robo Ky, Kliff, and Justice.
Anji Mito
Complete level 3-2 With Slayer.
Axel Low
Complete level 3-1 as Chipp Zanuff.
Baiken
Complete level 2-1 as Millia Rage.
Bridget
Complete level 2-1 as Ky Kiske.
Chipp Zanuff
Complete level 2-1 as Sol BadGuy.
Dizzy
Complete level 2-1 as May.
Eddie
Complete level 2-1 as I-NO.
Extra Soul
Press Start to pause game play during Story mode. Press Select to hide the pause menu, then press Up(2), Down, Left, Start. A sound will confirm correct code entry. This code can be repeated as many times as desired.
Faust
Complete level 4-1 as Sol BadGuy.
Gallery Test
Successfully complete the game with all characters. Then, highlight the "Quit" option at the main menu and press L + R + Circle.
Gold characters
Press L + R while choosing a character at the selection screen.
Guilty Gear XX #Reload or XX Slash: Fight against EX characters
Highlight the "Arcade" or "M.O.M." mode option at the main menu. Hold R while selecting that mode. You will now face the EX versions of the characters, or Kliff or Justice.
Guilty Gear XX Slash: Bonus characters
Complete the indicated task with a character to unlock his or her alternate versions. To select the new version, highlight that character at the selection screen and press Start. Highlight the desired version, then press X. Note: The EX and SP characters versions can also be unlocked by playing in Survival mode.
Press Start to pause game play in Story or Survival mode. Press Select to hide the pause menu, then press Down, Right(2), Up, Start. A sound will confirm correct code entry.
Potemkin
Complete level 3-2 as Bridget.
Slayer
Complete stage 2-2 as Millia Rage.
Testament
Complete level 4-2 With May.
Unlock Judgment in Judgment Mode
To unlock the character Judgment in Judgment (story) mode, get to level 6-1, and find all the letters of Judgment, hidden in various chests scattered throughout the level.