|Disgaea 4: A Promise Unforgotten character|
|Japanese Voice actor(s)||Mizuno Manabi|
|English Voice actor(s)||Michelle Ruff|
|Age||Unknown (Younger than Fuka)|
DES X is also the one responsible for killing Fuka and sending Desco down to Hades. DES X hates both Fuka and Desco and wants their dad all to herself. DES X was meant to destroy the Human World by orders of Judge Nemo, but she refused the order after her defeat, stating that the only one she'd obey is Fuka's father. She is called the "true final boss" by Fuka's father. When the party meets her at the end of Ep.8, she reveals the reasons behind Fuka's death and Desco's abandonment and also states that the party cannot defeat her. After she is beaten, she refuses to lose and transforms into a giant version of herself. Fuka learns of how DES X killed her solely for the reason that she wanted her father all to herself. Fuka is enraged by this revelation and powers up at the same time as DES X.
After she is beaten again, DES X states the reason behind Fuka's father creating all of the man-made demons including Desco and herself. The reason being that Fuka wanted a little sister who could help her take over the world. She also refuses to fight anymore or kill the humans which makes Nemo angry due to his initial plan of using her to destroy the humans.
DES X reappears during the final stage of the Fuka and Desco show, she claims that DES X is dead and she is now reborn as Earth X, Earth's Guardian God. DES X as Earth X noticably has a more lighter and calm voice similar to Desco's voice. She is the final boss of the Fuka and Desco Show and is recruited after defeating her.
DES X sees her creator as her father and is very obsessed with him. She killed his real daughter Fuka and Desco so she could have him all to herself. She was meant by Nemo to destroy the entire human race, but she rejected his orders on the count of her father being a human. DES X is somewhat calm when she was claming the party can't beat her even when she was losing to them. After DES X is defeated, she is reborn as Earth X , Earth's Guardian God. As Earth X, she is more beneviolent and dedicated to protecting the Earth. Earth has a lighter and a more calm mood than her previous self. Earth X also admits defeat easily compared to DES X who would not give up even being beaten twice in a row.
In battle, DES X has the Final Boss enemy class. She is a stronger version of Desco, having her first two unique skills and her Final Boss Setting and Mana Scarcity Evilites. She has high HP and Hit, followed by ATK, INT, DEF, and SPD. Her battle is fought in two phases. In the first phase, she is joined by two Professors and six Battle Suits. In the second phase, she is alone, but has turned into a giant monster with Desco's 3 Transformations Evility. In the Fuka and Desco Show's final stage, DES X now as Earth X is fought in her giant form, assisted by 4 Genociders(Tier 6 Android) and 4 Force Jokers(Tier 6 Battle Suit). She also has 5 Fuka Bio-Roids to assist her in battle.
DES X also appears as a DLC character. She can be unlocked as a playable charecter after the completion of the final chapter of the "Fuka and Desco Show" DLC. She has all of Desco's skills (minus Yog Sothoth) and Evilities, plus her own new unique Evility that increases her ATK by 40% when next to Fuka or Desco, and she can also Magichange into a sword. Unlike Desco, DES X is treated as a regular unit rather than a flying unit like Desco.