The Onion Knight is a Warrior of Materia in Dissidia Final Fantasy NT and its arcade version, representing Final Fantasy III. He is a Specialist type who fights with the style of a ninja or a sage. The Onion Knight returns from his original appearance in the 2008 Dissidia Final Fantasy and Dissidia 012 Final Fantasy, in which he had a similar battle style.
The Onion Knight's default player name is Nameless Boy, and his manikin counterpart is renamed Illusory Youth.
The Onion Knight's default appearance, called "Onion Knight" is based on the two red Onion Knights in the Famicom version of Final Fantasy III. Its first alternate coloration is an updated version of his "Luneth" attire in the PSP games, and is based on the blue Onion Knight in the Famicom version of Final Fantasy III, as well as Luneth's Onion Knight colors in its 3D remake. The second alternate coloration is based on the green Onion Knight in the Famicom version of Final Fantasy III, and Arc's Onion Knight colors in its 3D version. It colors his armor green and his hair ginger.
The first alternate costume, called "Bladewielder", is based on another of Yoshitaka Amano's "Unnamed Warrior" art, featured in Final Fantasy III. He retains his silver hair from the "Slasher" costume, but now dons a thigh-length light blue armor and cape with a white sash underneath. The first alternate coloration recolors his armor, cape, and boots a primarily black color with gray accents, and resembles his "Slasher" attire from Dissidia 012. The second alternate coloration recolors his armor jet black, his cape yellow, and his boots dark yellow.
I finally got it. I was a fool to defy my heart, just to bind myself to reason. I will protect Terra with my own strength. That's what's most important to me! Don't get me wrong—I still won't fight against anyone I can't beat. But I've decided in my heart to fight. That's why I'm going to beat you!
The Onion Knight is intelligent and analytical, usually finding solutions to problems through logic. He thinks more like an adult and dislikes those who treat him like a child. He is strong-willed, yet unsure of himself, usually using his head to get out of situations regarding him.
Onion Knight equips swords by default, ninja swords as the Ninja, and staves and the Sage. His staff and ninja swords are wielded by him during EX Skill. Excluding his default staff and blades, all of Onion Knight's weapons can be wielded and equipped in all versions of Final Fantasy III, exclusively for different job classes.
His default weapons are the Onion Sword, Eternity Staff, and Eternity Blades, based on the Unnamed Warrior's weapons from Yoshitaka Amano's Final Fantasy III art. The remaining alternate sets of weapons use original designs for the Onion Knight. The first alternate set of weapons consists of the Serpent Sword, Golem Staff, and Ashura. The second alternate weapon set consists of the Royal Sword, Rune Staff, and Kotetsu. The third consists of the Golden Sword, the Omnirod, and the Kiku-Ichimonji.
Onion Knight finds himself summoned back to World B, and reunites with everyone in Materia's domain. Confused as to why they have returned, he learns that their purpose is to fight one another so that battle energy can be harnessed to sustain the world's lifeforce. Their briefing is interrupted by Spiritus, and Materia orders them to instead fight against his warriors.
The Onion Knight decides to officially welcome Y'shtola to the battle and offers to be her guide, but is annoyed when Vaan offers to tag along. Before they can move on, a portal appears before them, and the Onion Knight and Vaan chase after Y'shtola who steps through out of curiosity. They find themselves in Midgar, a place that none of them recognize, but speculate that their presence and the memories they carry from their home worlds allows this realm to take on their form. They press forward through another portal, and find themselves in Rabanastre, illusion of Vaan's home.
The three encounter Kefka, who is destroying the city out of boredom. Onion Knight introduces him to Y'shtola as a villain he crossed paths with in the previous war, and the three fight him and his manikin companions. This triggers the planesgorgers to descend upon the realm and consume it, prompting the group to flee. They meet up with Terra, Squall, Zidane, and Lightning, and inform them of the planesgorgers' presence. After learning about the resident Eidolons the two groups return to Materia.
The Onion Knight takes part in the final clash to awaken Shinryu with the other champions, the dragon god responsible for the planesgorgers. He faces off against Exdeath with Zidane. The two are caught in one of the Emperor's traps but are rescued by Firion. Once Shinryu appears, the Onion Knight assists in slaying him once and for all. With the dragon finally defeated, the Onion Knight and the other warriors each return to their own worlds, leaving behind their essences in the form of crystals for the gods to use in their stead.
- Type: Specialist - Lands physical attacks to change into the lightning-fast ninja, or magical ones to switch to the sage and assault foes from afar.
- EX Skill: Job Change - Switches to either ninja or sage at random. If already playing as either job, Onion Knight's HP and Bravery will be restored as well.
|Sundry Strikes||Bravery||Ground (Onion Knight)|
|Unleash a flurry of strikes faster than the eye can follow.|
|Blizzard||Bravery||Ground (Onion Knight)|
|Cast an ice shard that pursues your enemy.|
|Fleet Pierce||Bravery||Aerial (Onion Knight)|
|Unleash a flurry of sword thrusts faster than the eye can follow.|
|Fire||Bravery||Aerial (Onion Knight)|
|Cast a fireball that pursues your enemy.|
|Ceaseless Strikes||Bravery||Ground (Ninja)|
|Lunge in quickly and unleash an even faster barrage of sword strikes.|
|Whirlwind Slash||Bravery||Ground (Ninja)|
|Spin your sword around and jump to gradually lift your foe higher into the air.|
|Wind Shear||Bravery||Ground (Ninja)|
|Spin so fast while attacking that you create a tornado.|
|Breakneck Pierce||Bravery||Aerial (Ninja)|
|Lunge in quickly and unleash an even faster barrage of sword thrusts.|
|Chuck a massive throwing star at your opponent.|
|Wheeling Thrust||Bravery||Aerial (Ninja)|
|Quickly descend while somersaulting to attack a foe below you.|
|Cast ice shards that pursue your foe. (Can move while casting)|
|Cast an orb of wind magic that slowly pursues your enemy. (Can move while casting)|
|Cast a fireball that speeds toward your opponent and eventually explodes. (Can move while casting)|
|Cast a fireball that pursues your opponent. (Can move while casting)|
|Cast an orb of lightning bolts that slowly pursues your foe. (Can move while casting)|
|Cast a holy orb that speeds toward your enemy and eventually explodes. (Can move while casting)|
|Sword & Sorcery||HP||-|
|Slash your foe with your sword, then send them flying with a fire spell. Charging increases potency.|
|Vex your target with a series of rapid blows. The number of attacks and range increase as a ninja.|
|Bombard foes with meteors from a distance. Range increases while you are a sage.|
|Engulf everything near you in an explosion. Larger effect radius as ninja or sage. Revert to onion knight after use.|
|Job Change||EX Skill||-|
- The Onion Knight was one of the first six characters announced for the arcade version.