Marduk is an extremely violent and short-tempered individual. He is very brash and tends to be quite unkind to others around him. Marduk's mannerisms are very questionable, as he is usually seen before or after a fight, screaming and acting like a vicious wild animal and breathing heavily and violently. This leads to the implication that Marduk is slightly unstable. Other actions that contribute to this is when Marduk killed King's mentor Armour King just because he was in a bad mood (albeit it may have been unintentional). The only people that Craig seems to actually care for are his loving parents as whilst unconscious in a hospital, King saw a family photo of Marduk's mother and father on a desk next to his bed.
Prologue Text: Undefeated for four years in the professional circuit, Craig Marduk was once a respected and feared Vale Tudo fighter. However, Craig was expelled from the professional ranks after being linked to a minor scandal. Bitter against his peers and society, Craig’s wrath consumed his soul. One day, Craig started a bar brawl in Arizona and killed an opponent during the fight, which turned out to be Armor King. Convicted for second-degree manslaughter, Craig was sentenced to ten years in the state penitentiary. Two years later, Craig was mysteriously released from prison. Some anonymous "benefactor" had apparently paid off numerous judiciaries to arrange for Craig’s release. An envelope is delivered to Craig shortly after his release. Craig opens the envelope to find a plane ticket and an article about The King of Iron Fist Tournament 4.
Epilogue Text: For Marduk, fulfilment was elusive... "Winnin' some tournament don't mean nothin'." When he realized where he was, he was heading back to the place of his former glory.
Ending Description: After winning the Tournament, Marduk returns to his place of former glory. There he meets the new Vale Tudo champion: an egotistic blond-haired man named Jeff Slater, who challenges him to a fight. Without accepting the fight, Marduk headbutts the new champion, instantly knocking him off his feet and tells him not to "bother getting up."
Prologue Text: Craig Marduk, the once undefeated Vale Tudo Fighter. Unable to accept his loss to King in the previous tournament, Marduk transformed himself into the ultimate weapon. One day, Marduk in a black jaguar mask, beat everyone in a Vale Tudo tournament to a bloody pulp. "King! You're next!" The stage is set for a rematch at the King of Iron Fist Tournament 5!
Epilogue Text: Marduk wins the Tournament and is crowned the new champion. For Marduk, being champion was not enough. He attack various martial art champions to show his superiority.
Ending Description: The scene opens with the words: "And today's target is..." Two boxers are getting ready to fight in a typical boxing match. The boxers have just begun their bout when Marduk comes into the ring and interrupts, challenging both of them to come at him. The referee tries to stop the madness, only to be K.O.ed by Marduk. The two boxers decide to attack Marduk but are easily taken down. Marduk taunts the audience and gloats in front of the camera, tearing up the ropes in the boxing ring for good measure. Steve Fox, who is in the audience, has a look of disgust on his face as he gets out of his seat to confront Marduk.
Prologue Text: Craig Marduk fought a grueling battle with the wrestler King in The King of Iron Fist Tournament 5. Victory and defeat eluded both fighters, and, in defeat, they found friendship. While returning to the waiting room, Craig was attacked. Catching only a glimpse of the attacker's back as he fled, Craig could have sworn he looked exactly like the man he was convicted of killing, Armor King. Determined to learn the assailant's true identity, Craig set out with his sworn friend, King, to participate in The King of Iron Fist Tournament 6.
Ending Description: While in a graveyard of the first Armor King, Marduk shoveled Armor King's grave, who should be dead to see Armor King's dead body. When he opens Armor King's grave, it was really him, who revealed he was dead. The mysterious figure, who resembles Armor King, gave Marduk a blank stare in silence after being asked who he is. Just as Marduk was about to know the truth behind who the figure is, King II arrived at the graveyard and asked the figure who he is, as the figure claims himself to be "Armor King" and no one else. Marduk believes this to be a lie, as he killed Armor King "with his own hands", but the figure calling himself "Armor King" said that the "Armor King" name is not exclusive to just one person. The figure calling himself "Armor King" said that he is the one, but so was his late brother, known as Armor King I, whom Marduk killed 2 years ago, thus making the figure "Armor King II". Armor King II deemed that his brother's murder was unforgivable and points at Marduk as a sign of revenge.
It is revealed when King tried to stop Marduk and Armor King II from fighting each other in attempt to make peace and explain everything to Armor King, both Marduk and Armor King ignore King's treaty, as Armor King II did not trust Marduk, and Marduk felt Armor won't listen to anything explanations but revenge, causing both fighters hurting each other and ending up in hospital. Marduk and Armor King II's reckless action led King to keep fighting for the fight money to pay for their hospital bills.
Marduk appeared in Street Fighter X Tekken as a playable character, his official partner is King.
Marduk is a playable character in Tekken Tag Tournament 2.
Craig is in a wrestling ring. He is versing Armor King, whom he knocks down with a strong arm attack straight to the head. Then Jaycee knees him from his side right in his face. He gets knocked into a corner, weakened. Then, King II is seen climbing up into the ring. Jaycee notices and runs backs to her corner of the ring and uses it as a boost to flip backwards and kick him with both feet in his chest, he is thrown out of the ring.
Marduk then breaks off one of the bars of the ring and swings it around. Armor King ducks but it knocks Jaycee down on her face. King II recovers, to see Armor King cornered by Marduk who is still swinging the bar around. Marduk finally throws up the piece up into the ceiling, making most the lights go out. Now there is only a spotlight on the ring. It turns out to be a distraction, as King II tackles him by surprise. He knocks him down so then Marduk picks him up and swings him around by one of his legs and slams him down. The bell dings as they are the winners. Both him and King II cheer and high five. The scene ends with them holding each other's arms up as they are the champions.
A traditional "big and slow" character with strong moves, great throws and a unique Mount grapple. His main drawback is that most of his attacks have a very slow startup time; making them unreliable when trying to beat an enemy to the punch let alone being an overall slow character in general. However, when his attacks do hit, players are rewarded with heavy damage to the opponent and also some very useful launch properties. His ready position is also another good tactic at unsettling opponents as the mount attack is very effective at promptly deplenishing a decent amount of an opponent's health without performing a combo.
Marduk is also one of the few characters that can grab opponents whilst in the air. This can be used during a juggle or just when the opponent jumps. His air grabs are a good tactic at dealing an extra bit of damage if used as a juggle finisher.
Craig fights using Vale Tudo. Vale Tudo is a fighting style that generally can be a mixture of any kind of fighting styles, ranging from wrestling to Judo to Sambo to Muay Thai.
Marduk does not seem to have a specific fighting style and is more acquainted to that of Brawling, much like Miguel. However, some of his moves are derived from wrestling as he can be seen using moves such as leg locks, throws and takedowns.