In Guilty Gear, she is the game's final boss. In Guilty Gear X she is absent from the game, except in the Plus version, where she and Kliff are hidden characters unlocked via missions. In Guilty Gear X2 however, she is a secret character only unlocked by beating her on Level 460 in Survival Mode, accumulating ninety-six hours of normal gameplay, beating all sixty Story Paths, or completing forty of the game's missions in Mission Mode. Despite her inclusion in these games, her well-above-average attack power, reach, speed, and defense make her illegal in most formal tournaments.
Before the recent Accent Core Plus R, Justice was the most overpowered character in the game, being able to deal an insane amount of damage as well as having the best mobility and defense of any character, boasting a fast running dash, a triple airdash, and a triple jump. Her normals are also fast, have ridiculous priority, and extremely long reach. In fact, Justice is the only character in the game that is so overpowered outside of Gold Mode that some of her combos are guaranteed to deal 100% damage. Justice can also zone very effectively using her N.B. Blasts, and she possesses an extremely powerful counter called Valkyrie Arc that counters all attacks, regardless of where the attack is intended to hit, or even if the attack is an Overdrive or Instant Kill. Her only weakness is that her Overdrives are extremely hard to pull off, forcing inexperienced players to use nothing but regular attacks and special moves.
Accent Core Plus R allows Justice and Kliff to be playable and balanced for arcade play, meaning she is now officially tournament-legal. As such, Justice has been retooled considerably: she has lost practically all of her mobility, as her walk speed is extremely slowed down and she can no longer dash, triple jump, or airdash. Valkyrie Arc no longer works on low attacks, and her damage output is severely weakened. To make up for this, she has been given all new versions of her N.B. Blasts that travel in different arcs and directions. Her gameplan revolves around setting up bomb traps to gain meter, then making use of her Force Break, Saperia Trance, to travel across the screen while causing wallbounce to go into devastating combos.
As of the second location test, she has gained a brand new Overdrive called Omega Shift. The move acts similarly to Sol's Dragon Install, granting Justice all of her old mobility options back (triple jump, dash, triple airdash). This adds yet another option to her gameplan: to build meter so she can use this move to transition to an offensive playstyle.