Dex Oyama

Dex Ogreon is one of the supporting characters of the Mega Man EXE series, along with GutsMan.EXE. He is Lan's rival and GutsMan.EXE's operator. He has a little brother named Chisao, that believes that Dex is the best NetOp in the world; and Dex tries desperately to maintain his respect.

Although his skill never quite allows him to defeat Lan, he is nonetheless a dedicated Netbattler who frequently ranks highly in several competitions and provides key assistance in a handful of incidents.


Dex acts very arrogant and boastful. He cares very much for Chisao, often panicking when he gets in trouble, and tries to maintain his respect in both the games and the anime. He also has a rivalry with Lan and the two compete whenever they can, usually by Netbattling.

He and Lan are similar in that they forget to do homework and do poorly in class. Dex also gets very mad when Mayl hugs Lan or shows any kind of affection for him at all. Dex cares deeply for his friends and is willing to risk his life for them. Dex has also been known to get emotional, like when he was going to move away to Netopia.

Game History

MegaMan Battle Network series

Dex and GutsMan can be fought in every game up to MegaMan Battle Network 4 for his chips. He often takes part in Lan's adventures, assisting him and sometimes needing to be rescued. Dex moves away to Netopia in MegaMan Battle Network 3, but returns later to help Lan fight the WWW. He appears to cheer Lan on during many occasions and to hang out with him. Dex also provides some humor in MegaMan Battle Network 5 by displaying the Houdini of the beach. In MegaMan Battle Network 6, it is revealed that he becomes mayor of ACDC Town in the future.

Anime History

MegaMan NT Warrior

Like in the games, Dex is Lan's rival. Prior to the series, Dex always defeated Lan in Netbattles; but, after Lan's generic NetNavi is upgraded to Mega Man.EXE, he is easily defeated. Dex provides comic relief in many episodes. Once, he was taken to the hospital because a robotic cat bit his leg and wouldn't come off (and his hurt leg was repeatedly struck, either by dropping onto a surface or being bit again). He also has a crush on Mayl, but is always turned down. He enters the N1 Grand Prix, but is defeated.

MegaMan NT Warrior Axess

In Axess, he goes to another country with the ex-WWW members to work at their curry shop called Number 2 Curry and train hard. When he comes back, he has a gung ho attitude and challenges Lan and MegaMan to a Netbattle. However, they are attacked by BurnerMan.EXE and MegaMan teams up with GutsMan to defeat him.

Other appearances

In later series, he continues to work at the curry shop, both as a cook and as a delivery boy, until moving back to work at Number 1 Curry. His appearances are less frequent compared to previous series.


  • Dex is one of the only two characters to actually attempt to Cross Fusion, but fail to do so. The other was the Cross Fusion Test Volunteer in Episode 1 of MegaMan NT Warrior Axess.
    • Mayl also attempts & fails to Cross Fuse in Episode 42 of Axess but later gains the ability to Cross Fuse in Episode 28 of Rockman.EXE Stream.
  • He is fond of action and shooting games.
  • Dex is good at Chess.
  • Dex's Japanese name (Dekao) includes the Japanese word 'dekai' which means 'huge', while his brother's Japanese name (Chisao) includes 'chiisai' which means 'small'.


          &nbsp Megaman3dlogovector Heroes

Mega Man Classic
Mega Man | Proto Man | Bass | Duo | Roll | Rush | Dr. Thomas Light | Dr. Mikhail Cossack | Eddie | Beat | Tango | Treble | Cut Man | Guts Man | Ice Man | Bomb Man | Fire Man | Elec Man | Time Man | Oil Man | Kalinka Cossack | Auto | Splash Woman

Mega Man X
Mega Man X | Zero | Douglas | Alia | Marino | Axl | Signas | Lifesaver | Depth Dragoon | Layer | Palette | Maverick Hunters | Cinnamon | Nana | Iris | Dr. Cain | Steel Massimo | Spider | Professor Gaudile | Aile | Chief R | Storm Eagle

Mega Man Zero
Zero | Dr. Ciel | Sage Harpuia

Mega Man ZX
Aile | Vent | Grey | Ashe

Mega Man Battle Network/NT Warrior
Lan Hikari | Mega Man.EXE | Mayl Sakurai | Roll.EXE | Eugene Chaud | ProtoMan.EXE | Dex Ogreon | GutsMan.EXE | Yai Ayano | Glyde.EXE | Bass.EXE | Higsby | NumberMan.EXE | Jasmine | Meddy.EXE | Masa | SharkMan.EXE | Little Boara | Tamako Shiraizumi | MetalMan.EXE | Shuko Kido | AquaMan.EXE | Raika | SearchMan.EXE | Anetta | Silk.EXE | Commissioner Kifune | Manabe | Misaki Gorou | Prisman | Ran Igarashi | Lilly | WindMan.EXE | Tensuke | TopMan.EXE | Kosuke | MistMan.EXE | JunkMan.EXE | Shuuseki Ijuuin | Charlie Airstar | GyroMan.EXE | Tesla Magnus | MagnetMan.EXE | Fyrefox | Nenjiro | Baryl | Colonel.EXE | Dingo | TomahawkMan.EXE | Ribitta | ToadMan.EXE | Mr. Famous | Punk.EXE | Sean Obihiro | Tora | King.EXE | Raoul | ThunderMan.EXE | Sal | WoodMan.EXE

Mega Man Legends
Mega Man Volnutt | Roll Casket | Tron Bonne | Servbots

Mega Man Star Force
Dr. Vega | Geo Stelar | Omega-Xis | Sonia Strumm | Lyra | Luna Platz | Queen Ophiuca | Vogue | Bud Bison | Taurus | Zack Temple | Pedia | Patrick Sprigs | Kelvin Stelar | Hope Stelar | Aaron Boreal | Tom Dubius | Bob Copper | Wolf | Cancer | Solo | Laplace | Amy Gelande | Ace | Acid | Queen Tia | Jack | Joker | Heartless | Dr. Goodall | Ice | Strong | Belle | Woodrow Boffin | WAZA Chief | Satella Police

Crossover Heroes
Alex Kidd | Billy Hatcher | Sonic the Hedgehog | Miles "Tails" Prower | Knuckles the Echidna | Sally Acorn | Rotor the Walrus | Bunnie Rabbot | Antoine D'Coolette | Nicole the Holo-Lynx | Amy Rose | Vector the Crocodile | Espio the Chameleon | Charmy Bee | Blaze the Cat | Silver the Hedgehog | Cream the Rabbit | Shadow the Hedgehog | Rouge the Bat | Amaterasu | Nights | Ryu | Ken Masters | Chun-Li | Vyse | Viewtiful Joe | Silvia | Tyris Flare

Non-canon Heroes
OVER-1 | Bad Box Art Mega Man | Mega Man (Captain N) | Quake Woman | Fan

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