Jack-O' is one of the three Servants of That Man (Asuka R. Kreutz) alongside Raven and I-No. Because her awakening remains incomplete, she can't function without her mask and toffee. Her past is shrouded in mystery, and her own memories are vague. Because she's in an unstable state, the tone of her voice changes rapidly.

Jack-O' is awoke prematurely by I-No to start with the plan of resurrect Aria, but for being asleep to long she escaped to the outside world to have some fun. While she was outside Jack-O' fought against a lot of characters, those were Bedman (who injured her legs), I-No, Axl Low, Ramlethal, Sin and Sol-Badguy who ended up defeating Jack-O' and demanded her to show him her face. When Jack-O' revealed her face, Sol is shocked by the incredible resemblance with Aria and then Jack-O' proceeds to explain who she is. By the time she finished her explanation Jack-O' disappears alongside Raven, awaiting for Asuka to come back to continue with their plan.

In the meantime Jack-O' and Raven were watching Sol and talking with each other until Asuka came back and proceed with the plan. He and Jack-O' were teleported to Illyria Castle to explain their plan and reveal the truth about Sol, Justice, the Universal Will and the Seeds. After all was explained Jack-O' went with Sol, Sin, Ky and Johnny to merge with Justice while Asuka went to the his old lab alongside Paradigm and Zappa to prepare the Saint Oratorio (a type of unlimited Magic energy) to fuse Jack-O' with Justice.

Once they reached Justice and Ariels' location, Jack-O' extracted Elphelt from Justice and prepared herself for the Saint Oratorio, while Sol, Ky and Sin fought against Ariels. After an intense battle and the intervention of Raven and Ramlethal, Jack-O' receives the Saint Oratorio, which also severely weakens Ariels, who was in the path of the beam. However, the energy of the Saint Oratorio wasn't enough to fuse her with Justice because of the trauma that she was still suffering, and the only way of merge with her is to get hit by a greater amount of energy than the Saint Oratorio. In that moment, Third King Daryl appears with a fleet of airships equipped with Collider Cannons with the intent of eradicating Justice while she was still incomplete. After teleporting everyone but Sol to the ship, Daryl fires the cannons to destroy both him and Justice. But in that moment, Axl compressed time in order Sol a chance to receive the Saint Oratorio with his Junkyard Dog MK III and maximize the energy with his Dragon Install, hitting Jack-O' with it and forcing the merge between her and Justice, which creates a new version of Aria in the end. She was last seen being carried by Sol as the new Aria.
 

 

Page Updated:  Aug. 15th, 2021
Jack-O was an interesting female newcomer in Guilty Gear Xrd. As a later DLC character of the sequel to the first Xrd title (SIGN)... her arrival didn't exactly bring much "hype" to those who didn't follow the serious religiously. However, she's a lot more interesting than she might seem at first glance. Her "tower defense"-style friends that join her in battle bring a clever and innovative mechanic into the world of fighting games. In my opinion, she was one of the most interesting characters to use (and watch) in Xrd. Visually, she's not extremely unique or interesting... but her Jack-O-Lantern mask brings along some good Halloween vibes. I'm glad she returned in -STRIVE-... although I think her white /blonde hair suited her better than the red.
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