Guilty Gear Judgment Codes -

Alternate Arcade mode
Highlight the "Arcade" option at the main menu, then hold and press . 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 and press . 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.

Faust
Complete level 4-1 as Sol BadGuy.

Jam
Complete level 3-2 as Potemkin.

Johnny
Complete level 2-2 as Dizzy.

Judgment
In level 6-1, find all the letters that spell "JUDGMENT" that are in the various chests scattered around. Doing so will unlock Judgment in Judgment mode.

Potemkin
Complete level 3-2 as Bridget.

Slayer
Complete stage 2-2 as Millia Rage.

Testament
Complete level 4-2 With May.

Venom
Complete level 3-1 as Eddie.

Zappa
Complete level 2-2 as I-NO.