Obanno is a high ranking member of the Lord's Resistance Army. He also has ties to Quantum represented by the mysterious Mr. White. Obanno banks a considerable sum ($101,260,000) with another of White's associates, Le Chiffre.
Le Chiffre ends up losing Obanno's money when one of his stock shorting schemes fails due to Bond's intervention. Without notifying Obanno or Mr. White, Le Chiffre arranges a high-stakes poker tournament at Casino Royale in Montenegro to recoup the loss.
When Obanno learns of the loss of his money he and his bodyguard travel to Montenegro, break into Le Chiffre's hotel suite and ambush him and his mistress Valenka; threatening to cut off one of her arms. Le Chiffre, however, is not moved by the threat and implores Obanno to give him one day to win the tournament and recoup the loss. Obanno grants this and leaves the suite. In the hall, Obanno and his bodyguard notice Bond and Vesper lurking in the vicinity. When the bodyguard sees the hearing device in Bond's ear, he moves to attack Bond, who throws him over a stairwell to his death. Obanno then attacks Bond with a machete concealed inside his jacket. He and Bond then engage a brutal fight in the stairwell. As the fight ends at the bottom of the stairwell, Bond gains the upper hand and strangles Obanno to death with a rear naked choke. Mathis then disposes of their bodies by framing one of Le Chiffre's henchmen for their murder.
Dimitrios is a government contractor who has worked in Iraq, Afghanistan, Chechnya, Rwanda, Nicaragua, and El Salvador. He is also a dealer in arms and information with ties to various death squads and right-wing paramilitary groups around the world. He is a known associate of terrorist financier Le Chiffre, who uses him to do the dirty work in many of his stock shorting schemes. He is married to Solange. In the film he's tasked with hiring someone to blow up a new superjumbo airliner that is to be unveiled at Miami International Airport.
Dimitrios and Solange are in the Bahamas when they encounter Bond. He and Bond play a game of poker, which results in Bond winning an Aston Martin DB5. Later that night, Bond tails Dimitrios to Miami where he is to meet with Carlos at a Body Worlds exhibit. He is killed when Bond quietly stabs him and leaves his body at the exhibit.
Valenka is the alluring companion of Le Chiffre, following him wherever he goes, and is also romantically involved with him (though in the novel, it is stated that Le Chiffre is a heavy womanizer though he plans on settling down and having a family). She is first seen swimming in the sea next to Le Chiffre's luxurious yacht in a blue swimsuit while they are in the Bahamas. She encounters Bond during the poker tournament in Montenegro, and poisons his drink on Le Chiffre's orders. Along with Le Chiffre, she is attacked by Steven Obanno and his henchman in their hotel room. Obanno threatens to cut off her arm with a machete - notably, Le Chiffre does not protest her impending dismemberment, causing Obanno to tell Valenka that she should get a better boyfriend. Obanno does not cut off her arm, however, and she stays with Le Chiffre. She is possibly killed by Mr. White along with Le Chiffre and the rest of his associates.
Kratt is Le Chiffre's German righthand man/bodyguard and is never far from his side. He first appears in Uganda when Le Chiffre meets Steven Obanno. It is unknown whether or not he was killed along with Le Chiffre by Mr. White's associates when found torturing Bond and Vesper.
Leo is one of Le Chiffre's henchmen who first appears alongside Kratt at the Casino Royale in Montenegro. He is arrested by the local police after Bond's ally Mathis places the bodies of Steven Obanno and his bodyguard in the trunk of his car.
Mollaka is encountered in Madagascar where he is being shadowed by Bond and his co-agent Carter at a mongoose/cobra fight at an abandoned hotel. Due to a foolish mistake made by Carter he catches on and leads Bond on a high speed footchase through the jungle and through a construction site before ending at the Nambutu Embassy, where he was an employee. Bond follows him into the embassy where he incapacitates him and attempts to take him into custody. The attempt fails, Bond then kills Mollaka with a bullet to the chest before escaping. Bond manages to steal Mollaka's cellphone which eventually leads him to Alex Dimitrios in the Bahamas.
Carlos is first seen by Bond as he leaves the Body Worlds exhibit in Miami. Bond tails him to Miami International Airport where he loses track of Carlos after they clear the security checkpoint. Carlos changes into a uniform worn by the Miami-Dade Police Department and sneaks into the secure area where he sets off the airport's fire sprinklers causing a mass panic and evacuation at the airport. Under the cover of the chaos, he drives onto the tarmac and kills an airport tanker driver by breaking his neck.
He secures a small but powerful keyring bomb on the edge truck before he drives away with it. Bond makes it on to the tarmac and gives chase before leaping onto the back of the tanker. In an attempt to shake Bond off, Carlos drives the tanker into various airport vehicles, attracting the attention of the police and security personnel. Bond makes it into the cab and a brutal fight ensues with Carlos leaping from the tanker as it crashes towards the superjumbo airliner. At the last second Bond takes control of the tanker and brings it to a stop inches near the airliner. Bond is mistaken for the terrorist and is violently subdued by the police. He sees Carlos off in the distance about to detonate the bomb. Unknown to Carlos, Bond had removed the bomb from the tanker and clipped it to Carlos' belt, and Carlos dies from the resulting explosion.
Gettler is an assassin working for Quantum (in the film) and SMERSH (in the novel). He wears a panama hat in both the film and novel. Also, he wears an eyepatch in the novel, while in the film he wears glasses with a darkened left lens. He is supposedly a Swiss watch salesman.
In the moment when Bond shoots him, a photo of Dryden together with his wife and daughter is shown for a split second, which he takes with him to his death.
Tall Man is Gettler's main bodyguard/Henchman during the Venice climax and the only other villain credited from that sequence. He is played by Actor/Stuntman Leos Stransky.
Tall Man first appears alongside Gettler when they are to retrieve the money from Vesper. Gettler is shown handing the silver case containing the money to Tall Man who is standing behind him. When Bond is discovered Tall Man flees with Gettler taking Vesper as their hostage and escaping into a building under renovation. Tall Man takes position on the upper floor waiting for Bond to come through the doors but is thrown off balance when Bond shoots out the air bags holding up the building's foundations. Bond fights his way through the other assassins before confronting Tall Man. The two are seen crashing through a wall whereafter Bond stuns him with a blow to the face and uses him for a human shield as Gettler opens fire, shooting Tall Man in the shoulder. He is finally killed when the elevator shaft in the center breaks free and crushes him to death.
Obanno's Lieutenant is a henchman to Steven Obanno, although he never has any speaking role.
Obanno's Lieutenant appears in Uganda. Whilst Obanno talks to the sinister Mr. White, Obanno's Lieutenant keeps his eye on the doorway, his job apparently being to keep a lookout for Le Chiffre and Kratt who are expected. Later when Le Chiffre and Kratt arrive he opens up several suitcases of money, and then later helps put the funds in the back of Le Chiffre's convoy.
Obanno's Lieutenant later appears in the Casino Royale where he ambushes Le Chiffre and his girlfriend Valenka in their hotel room. Whilst holding Valenka, Obanno's Lieutenant forces her to hold out her arm, after Obanno demands a keepsake for the betrayal, but saying that Le Chiffre needs his hand to play cards. After Obanno grants Le Chiffre some more time to get the money, Obanno and his Lieutenant leave. Whilst he and Obanno are exiting through the hallway they see James Bond and Vesper Lynd standing in a doorway kissing. However Obanno's Lieutenant spots the earpiece in Bond's ear and hears Valenka's crying. He draws a gun and shoots at Bond, although missing him by inches. As he chases Bond into the stairwell, Bond grabs his arm and throws him over the stairs to his death. His body is later seen in Leo's trunk so as to frame Le Chiffre's henchman for murder.