Yako Tenma (天馬夜行;Tenma Yakōu)
The main antagonist of Yu-Gi-Oh! R. He is the protégé and adopted son of Pegasus, and the biological twin brother of Gekko Tenma, who wants revenge for Pegasus' death and disappearance, although unbeknownst to him, it was actually Dark Bakura who killed him.
Yako uses a Wicked God Deck that focuses on Level modification tactics to bring out multiple monsters, which he can Tribute for the Summoning of the Wicked Gods, particularly The Wicked Avatar.
- All Your Base Are Belong to Us: He takes over KaibaCorp to use it's vast technology in his plot.
- Avenging the Villain: Unfortunately, Yako's trying to get revenge on the wrong person; other than defeating him at the end of Duelist Kingdom, Yugi didn't have a thing to do with Pegasus's death. The real culprit never even makes an appearance.
- Big Bad: of Yu-Gi-Oh! R
- Brainwashed and Crazy: Yako is possessed by the Wicked Avatar. Gekko could also qualify during the period he is controlled by Yako.
- Cain and Abel: Inverted - Yako is the younger but evil brother, while Gekko is the older but good brother.
- Canon Foreigner: He's only appeared in a spin-off so far.
- Cherry Tapping: The Wicked Avatar is always exactly ONE attack point stronger then the strongest monster on the field, but as Yako points out, that one attack point makes all the difference.
- Cloning Blues: Played with, as while Yako and Gekko are natural identical twins, flashbacks reveal that Yako always felt like an inferior copy of his twin brother.
- Evil Counterparts: The Wicked Gods for the God Cards, and possibly Yako himself for Gekko, depending on how you look at it.
- Expy: Yako is Pegasus's Expy. Goes crazy after losing a loved one? Check. Wants to bring said loved one back regardless of what it takes? Check. Takes someone close to Yugi as hostage? Check. Even lampshaded by Gekko when he mentions Yako is just like Pegasus.
- I Have Your Wife: Yako kidnapping Anzu drives the entire plot.
- Mad Eye: His right eye bulges very nastily when he's at his most volatile.
- Revenge by Proxy: Yako targets Yugi by turning Anzu into a Human Sacrifice so he can resurrect Pegasus.
- Sempai/Kohai: Yako is Pegasus' kohai. One of them.
- Shapeshifter Guilt Trip: During the final showdown against Yako, The Wicked Avatar takes Yugi's form. Yako says it's a manifestation of Yugi's hatred for his other self for being the true Game King and preventing Yugi from earning that glory himself. Yami almost falls for it, until Yugi briefly takes over and insists that he would never have been able to make so many new friends or broaden his horizons if it hadn't been for his other self.
- Theme Twin Naming: His given name means "Night Verse", as opposed to Gekkou's who means "Moon Verse" Doubles as Meaningful Name as it reflected how he was always under the shadows, the night's darkness as opposed to his brother who is always in the spotlight. Lampshaded by himself during his match against Yugi.
- Took a Level in Badass: He went from being ridiculed as a "bad copy" of Gekko before the beginning of the series to a Duelist that defeated Seto Kaiba. And he came close to beating Yugi as well, no less than three times. Even when he wasn't using the Wicked Gods, he still retained his prowess.
- Twin Switch: Sort of - Yako pulls a Grand Theft Me on his twin brother, Gekko, in order to test his new deck against Yugi.
- The Unfavorite: Yako believed he was the worse duelist out of the two. Pegasus described Gekko as a perfect duelist, while Yako was "an unfinished rough diamond." Subverted by the end of the series, where it is revealed that Pegasus saw the potential in Yako to be a great duelist, hence the "rough diamond" metaphor, while Gekko had "perfected" himself and was incapable of growing any stronger.
- Underestimating Badassery: He gives Jonouchi, a Duelist Kingdom finalist and Battle City semi-finalist a ten dollar bounty to start, and it takes a while to go up to anything considerable. The same Jonochi who proceeds to wipe the floor with at least half his card professors.
- With Great Power Comes Great Insanity: Yako used to be a quiet, withdrawn young man. That all changed once he started creating the Evil Gods, which warped his grief over Pegasus' death into homicidal rage toward Yugi.
- Butt-Monkey: NOT Played for Laughs. Seriously, by the time the manga takes place, does the guy ever get something nice other than his victory against Ted Banias? His younger twin hijacks his body. Everyone he met on his way to Yako called him a traitor for siding with Yugi. Then he loses, and Richie gave him "The Reason You Suck" Speech. After Mokuba opens the way for him and Yugi, he was Punched Across the Room by Jounouchi (who mistakes him for Yako). When he reached the top, Yako laughed his ass off on how "The Perfect Duelist has fallen." Lastly during the final match between Yako and Yugi, Kaiba brushes it to his face that it's his fault that Yako become full of hatred and envy. Seriously, give the guy a break. All he wanted is to bring his twin's sanity back.
- Everyone Has Standards: He admits he wants to met Pegasus again, just like Yako... But not with sacrificing anyone. Depre, Richie, and Yakou all called him out on this.
- Foolish Sibling, Responsible Sibling: Responsible for Yako's insanity. The second he gained control over his own body again, he decided to assist Yugi because he felt responsible for everything that Yako has done.
- Identical Twin ID Tag: By the time R takes place. While both wear a maroon coat, Yako's gakuran are pink, while Gekko's are white. Also it's hard to notice but Yako actually has longer back hair than Gekko. Yako's back hair reached his waist while Gekko's back hair only reached his chest. Why Yugi doesn't notice this? Because he never sees Yako from the back, that's why. Their front hair are still the same.
- Our Elves Are Better: His deck mainly uses elves, and he is The Ace. who matured and stopped growing earlier than the others.
- Polar Opposite Twins: Yakou has an unstable mind and still very dependent on Pegasus, (which drove him into becoming the Big Bad of R.) Meanwhile Gekko is mature, calm, gentle, and reasonable and grew independent when Pegasus disappeared. In their past, they are this too. Gekkou is cheerful and proud while Yako is gloomy and full of envy.
- Punched Across the Room: Courtesy of Jounouchi, who mistook him for Yako. When Yugi ran to him calling his name, Jounouchi realized he punched the wrong person and immediately apologized. Gekkou forgives Jounouchi the instant he apologized, because they are twins after all.
- Token Good Teammate: Among Pegasus' foster sons that appeared in R. See Everyone Has Standards above.
- Wham Line: "My growth is over". Yako takes that as an insult.
As a Whole
- Ambiguously Evil: Though a few are quite arrogant, they're not nearly as devious or cruel as the Ghouls or Player Killers.
- The Chessmaster: They all put up a decent offensive with few weaknesses, using more advanced techniques then previous duelists used.
- Informed Ability: They're considered elite duelists, but all but one of them are beaten by Yugi, Jonouchi, Kaiba, and Gekko.
- Only in It for the Money: Their prime motivation. While other duelists wanted to duel Yugi for glory, they're only dueling him because he's worth over $100,000.
- Theme Naming: They're all named after michrochips.
- The Worf Effect: Despite their impressive use of card combos and powerful monsters, their statuses as professors is undermined by a group of teenage boys.
- Worthy Opponent: They all come to view Yugi and Jonouchi as this.
Deschutes LewThe first duelist Yugi faces. His deck consists of high-defense monsters, with Castle Gate being his main card.
- Beard of Evil: Averted. He's a pretty nice guy when he's off the clock.
- Punch-Clock Villain: He doesn't take his position seriously, only doing what he was paid to do.
- Stone Wall: His main strategy.
- Warm-Up Boss: His role is limited to dueling Yugi and providing exposition on what he can expect if he beats him.
Tilla MookThe second duelist Yugi faces. She uses a Vampire deck, with Vampire's Curse being her main card.
- Goth: Dresses in period clothes, uses vampires and has a holographic projection of a misty graveyard provide atmosphere for her entrance.
- Light Feminine and Dark Feminine: The dark to Maico and Reico's light.
- Nightmare Fetishist: She seems to enjoy getting bit by her Vampire's Curse card just a little too much.
- You Are in Command Now: Jonouchi gives her the coveted black duel disk, marking her as the best duel professor.
Klamath OslerThe first duelist Jonouchi faces. He uses an Insect deck, with Antlion being his main card.
- Anime Hair: Looks like Astro Boy
- Animal Motifs: Bugs and worms.
- Big Creepy-Crawlies: Especially creepy.
- The Napoleon: Quite short and acts like he has something to prove.
Kirk DixonYugi's third opponent. He uses a Machina deck, with Machina Force being his main card.
- Combat Pragmatist: Knew that Yugi's confidence could be shaken if his friends were taken out of the picture, so he laid traps to separate Yugi from Honda and Jonouchi.
- Crazy-Prepared: Rigged his entire area with booby-traps in the hopes that at least one of them would be triggered.
- Four Eyes, Zero Soul: Wears glasses and is absolutely ruthless.
- Hoist by His Own Petard: After being beaten by Yugi, he steps on one of his own traps and is flung into the basement.
- Killer Robot: His deck's theme.
Pete CoppermineJonouchi's second oppoent. He uses a Mutant deck, with Mutant Mindmaster as his main card.
- Anime Hair: Heavy Metal-style.
- Body Horror: The theme of his deck.
- The Gadfly: Spooks Jonouchi on sight and overall seems to enjoy practical jokes.
- Goth: Of a cyber-punk variety. He wears tight black clothes with heavy eyeliner, wild hair and uses cards based around mutations.
Maico KatoYugi's fourth opponent. She uses forest-themed cards, with Green Baboon, Defender of the Forest as her main card.
- Cool Old Lady: Plays Duel Monsters with her grandchildren and planned to use her payment to buy them more cards. She also gave Yugi a run for his money.
- Friend to All Children: Loves her grandchildren dearly.
- Handicapped Badass: She's wheelchair-bound, but her skill at Duel Monsters rivals Yugi's.
- Silk Hiding Steel: She doesn't act like a typical antagonist duelist and her strategy is based around stealth.
- Token Good Teammate: She's not after Yugi for the status and while she is in it for the money it's to buy nice gifts for her grandchildren. She also is extremely polite to Yugi before and after she loses, taking her loss well instead of freaking out unlike most card professors.
Mendo CinoJonouchi's third opponent. He uses a Mantis deck, with Dreadscythe Harvester as his main card.
- Animal Motifs: Mantises
- Big Creepy-Crawlies: And they breed.
- Underestimating Badassery: Considered Jonouchi paltry due to his bounty being only $500. When Jonouchi beat him, he was shocked that such a skilled duelist would be so undervalued.
Willa MetteA card professor that Seto Kaiba duels. He uses a Dragon deck, with White-Horned Dragon being his main card.
- Break the Haughty: Was hoping to do this to Kaiba. It backfired.
- Bullying a Dragon: He targets Kaiba specifically. It goes about as well as you'd expect.
- Man of Kryptonite: His deck was specifically constructed to counter Kaiba's strongest cards.
Ted BaniasA card professor that Gekko Tenma duels. He uses a Beast/Beast-Warrior deck, with Assault Lion being his main card.
- Anime Hair: He resembles Sasuke Uchiha
- Break the Haughty: Assumed that he could beat Gekko based solely around the fact that he didn't have any monsters out. Gekko showed him that he's so good he doesn't need monsters.
- Good Eyes, Evil Eyes: Narrow, with small pupils and pronounced tear troughs.
- Smug Snake: Gloated over the fact that Gekko wasn't drawing any monster cards. Turns out Gekko didn't need any to beat him.
Reiko KitamoriJonouchi's fourth opponent. She uses a Puppet Chess deck, with Puppet King being her main card.
- The Friend Nobody Likes: The only reason she was recruited was to help stall for time.
- Nice Girl: Very sweet, to the point that she refrains from attacking until Jonouchi presses her.
- Token Good Teammate: The other one. She's only part of the occupation of Kaiba Corp because she was forced to come by the other professors and has to be chased down for her duel.
- Villainous Crush: She's implied to have one for Jonouchi.
Depre ScottYugi's fifth opponent. He uses a Cosmic deck, with Greed Quasar being his main card.
- Starter Villain: For Yugi. He's the first villain Yugi takes on with his own deck rather than one shared with the Pharaoh.
- Underestimating Badassery: He assumes regular Yugi is no match for him and insists Yami come out and deal with him personally. Yami lampshades this, only coming out to talk up his partner with Yugi then managing to turn things around.