Central Academia
Academia
The Fusion Dimension's main Duel Academia. They are major antagonists of the series, who make it their life's mission of attacking other dimensions and sealing their victims into cards. A majority of the characters shown from this dimension are quite sadistic, treating their heinous actions as a "hunting game" and laughing about the destruction that they cause. Those who aren't overly sadistic are instead fulfilling the mission they were given out of fear.Archetype: Spirit
Reiji's father, who three years ago went to the Fusion Dimension, where he became the Professor, the head of Academia. He is the instigator of the interdimensional war with the intent to unite all dimensions and revive his daughter Ray. He is one of the survivors of the United World.
- Foil: To Yuya. Both lost people that were important in their lives and aim to bring them back. However, the methods they take to do so couldn't be more different.
Samejima
Archetype: Cyber Ogre
The original owner of Central Academia before Leo Akaba came along, and the one who brought Yuya and his brothers together to form the Dragon Soldier Squad.
- The Leader: He is the founder of the Dragon Soldiers.
- Like a Son to Me: He feels this way toward Yuya and his brothers.
Sora Shiunin
Archetype: Death-Toy
A resident of the Fusion Dimension. He first appeared before Yuya as an annoying stalker, dubbing himself his pupil. Yuya reluctantly dueled with him, during which Sora's true nature was revealed. After the duel, he was denied enrollment and kicked out.
- Sadist: He takes great pleasure in inflicting harm on whoever he duels.
- Sore Loser: Does not take losing very likely, especially to Xyz Duelists.
- Stalker without a Crush: Acts like this towards Yuya after Yoko takes him in. Yuya does not approve one bit.
Dennis Macfield
Archetype: Entermage
A resident of the Fusion Dimension, he was originally on Academia's side only to defect after indirectly causing the invasion of Heartland.
- Adaptational Heroism: Dennis proves himself to be this after deciding to defect from the Academia troops.
- The Atoner: He definitely feels shame for greenlighting Academia's invasion of the Xyz Dimension.
Fubuki Tenjoin
Archetype: Red-Eyes/Valedictorian
Archetype: Alchemy Beast
Barrett
Archetype: Beastborg
Barrett is a Duel Soldier from Academia. He uses a Beastborg deck based around fusing together Beast-Warrior-type and Machine-type monsters, and inflicting burn damage to the opponent.
Archetype: Entermate
One of the few survivors of the split of the United World. Before the split, he was the Duel Monsters Champion, and, per an agreement between Leo Corporation and Sakaki Incorporated, arranged to be married to Leo Akaba's daughter Ray. During a Duel Monsters training camp, he was defeated by newcomer Zarc, causing Ray to favour him instead. They became rivals, and years later he was defeated again during a Title match.
- Two Aliases, One Character: It's revealed in Part 2 that Yusho and Raider are one and the same.
Edo Phoenix
Archetype: Destiny HERO
Tyler Sisters
A pair of Tag Team Twins who arrive to the Xyz Dimension under the Professor's orders to eliminate the Dimension Guardians. They use Amazoness decks.
Tropes associated with the Tyler Sisters:
Gloria Tyler
Archetype: Amazoness
The older sister of the two.
Tropes associated with Gloria:
Grace Tyler
Archetype: Amazoness
The younger sister of the two.
Tropes associated with Grace:
- All Love Is Unrequited: She has a crush on Yuya, though he isn't too fond of her.
Takuma Saiou
Eve
Archetype: Mystic
Kaiser's Squad
Hell Kaiser Ryo
Archetype: Cyber
- Ambiguously Evil: By Part 3, he appears to be this. At the beginning of the overall story, it seems he supports Leo Akaba's ARC Area Project (as he leads his squad in the invasion of Heartland, and duels Shun and Kaito in a rather ruthless manner), but when he duels Yuya, he has fun. Eventually it's revealed during his duel against Leo that he never supported Leo's plans and only acted the way he did to inspire the Academia soldiers to do the same, and inspire those he dueled previously to not rely on anger and violence to succeed in the war.
- Stealth Mentor: Kaiser is shown to be this toward Shun and Kaito.
Tyranno Kenzan
Archetype: Dinosaur
Jun Manjoume
Archetype: Power
Daichi Misawa
Archetype:Six Attributes
Junko and Momoe
Archetype: Antique Gear
North Academia
Johan Andersen
Archetype: Gem Beast
The top duelist of North Academia and Serena's father.
South Academia
Jim Crocodile Cook
Archetype: Fossil
The top duelist of South Academia and one of Serena's caretakers.
West Academia
Austin O'Brien
Archetype: Volcanic
The top duelist of West Academia and one of Serena's caretakers.
Professor Cobra
The Seven Stars
Tania
Archetype: Amazoness
Camula
Archetype: Vampire
Gravekeeper's Chief
Archetype: Gravekeeper
Titan
Archetype: Demon
Sanders
Archetype: Gladiator Beast
Doctor
Archetype: Parasite
Atlantis School
Rafael
Archetype: Guardian
Dartz
Egypt
Dragon Soldiers
Yuto
Archetype: Phantom Knights
Yugo
Archetype: Speedroid
Yuri
Archetype: Predator Plants
Other
Manjoume Group
The Manjoume Group comprises of Jun Manjoume's two older brothers. They have the goal of dominating the world through politics, finance and card games.Tropes associated with the Manjoume Group:
Chosaku
Archetype: Dragon
Chosaku is one of Jun's older brothers. He is at the top of the political world.
Tropes associated with Chosaku:
Shoji
Archetype: A-to-Z
Shoji is one of Jun's older brothers. He is at the top of the financial world.
