Our "hero" in the series's first 3D title - a very competent street thug betrayed by his girlfriend Catalina during a bank heist. Escaping police custody, he goes on an epic quest in Liberty City to make as much money as possible, destroy things, kill people, and take revenge at some point.
Best Served Cold: One interpretation of the game is that all of Claude's murders, mayhem, and madness was all to get at Catalina.
The Cameo - Has an appearance on a movie poster in Vice City, and in IV, Niko can don his leather jacket and green pants. In addition, graffiti with his name on it can be seen in an apartment building.
Knight Templar: After falling arrested in 1998, he vows revenge eliminating all rival mafias. Although it could also have to trope in San Andreas, where he promises to kill CJ, his family and everyone close to him.
Arguably, becomes a Genocide Backfire since Claude hadn't yet shown any sign of trying to betray him.
Salvatore Leone's much-suffering wife. Maria willfully cheats on him, uses drugs, and shows no interest in him. Later becomes involved with Claude, where her feelings become more genuine. Becomes a supporting character in Grand Theft Liberty City Stories Stories and has a cameo in Grand Theft Auto: San Andreas.
First appeared in GTAIII as a Capo for Liberty City's dominant Leone Mafia family. Later used as the protagonist of the prequel title Grand Theft Auto: Liberty City Stories, where he has returned from a long absence to help organize said family's success. Has an unsupportive, domineering mother who embarrasses him at every turn.
Ax-Crazy: More specifically in the mission "Dead Meat" (from GTA: Liberty City Stories) where he, indignant to be enduring Giovanni Casa, Toni proceeds to brutally dismember him with an ax, and finally carrying their leftover meat to his butchery.
Salvatore Leone's son and Underboss of the Leone Crime Family. He's not very involved in the family business, preferring to work on his garage business. He's Misty's boyfriend (or at least her most recurring customer, given her line of work), but Joey does give Claude some work by having him collect some debts that the Forelli Brothers owe to the Leone Family.
Badass Driver: Implied to be involved in street racing and supes up some excellent sports cars.
"Well Done, Son" Guy: Joey Leone is not very involved in Mafia business beyond car thefts and the occasional robbery or debt collection, and as such, it is implied in LCS Salvatore trusts Toni Cipriani more than him.
Asuka is the head of the Yakuza in Libety City. A fierce rival to the Leone family, she is an old friend of Maria's.
The brother of Kenji and owner of Kenji's Casino in Liberty City. He is the co-leader of the Yakuza in the city.
Asian Speekee Engrish: His accent is far stronger and more stereotypical than Asuka. Lampshaded in his bio, which claims that his "funny way of speaking" is one of the reasons he's lower on the Yakuza chain of command than Asuka.
Cool Car: His desire for these is his chief reason for employing Claude.
Killed Off for Real: At Claude's hands, in order to spark an all-out gang war between the Yakuza and the Colombian Cartel.
Claude's ex-girlfriend; she shoots him in the bank heist getaway and leaves him for dead. Catalina appears at various points throughout the game in league with anyone Claude's working against, although she's primarily associated with the local Colombian Cartel, and in the end she kidnaps Claude's (presumed) latest love interest to force a final showdown.She also makes an appearance as a supporting character in San Andreas; when C.J. is forced out of Los Santos, her cousin (and C.J.'s sister's boyfriend) Cesar Vialpando sets the two up for a crime spree throughout the countryside. A violent one sided (with Catalina as the active party) love affair begins to take form until she finds Claude, and the two leave the state to harass C.J. with obscene phone calls for the rest of the game.
Ax-Crazy - In GTAIII, she already shoots two of her apparent love interests, but it goes even further in San Andreas: she has graves dug by her house, she sexually abuses C.J. (and still thinks she loves him), she threatens to kill/castrate C.J., and she takes glee in killing any cops or civilians who get in her way.
Ungrateful Bastard: Puts a bomb on your car after you save his life, twice. Though to be fair, it's likely he didn't even know that bomb was meant for you.
Phil appears in every single game from the GTA III continuity (with the only exceptions being San Andreas and Advance). He is a weapon-dealer who specializes in big guns...really big guns. His first appearance is in GTA III, where he only appears in one mission, wherein Claude helps him defend his weapon supply from the Colombian Cartel. At this point he wears military clothing and is nicked-named "The One Armed Bandit" because of his left arm he claims to have lost doing a battle in Nicaragua. In Vice City, were his screen time is vastly expanded, it is revealed that never was in the army, but was repeatedly turn down because of bad temper and heavy drinking, and that he, in fact, lost his arm do to an accident with some home distilled alcohol and a homemade bomb. Apparently he would later make his friends keep up the lie. In what is presumably a Continuity Nod, Phil only appears in a short cameo in Liberty City Stories, while Vice City Stories once again features him a bit more prominently.
* While being very drunk* "The thing is Vicky boy, my daddy was an angry man. He never, ever told me I was special. In fact - he used to beat me. Especially when he caught me staring at my cousin or my sister. You know what he said to me? He said I'd be better off dead..."
Liberty City's resident media mogul; first introduced in Grand Theft Auto III seeking Claude's services for McGuffin escort. After having a cameo in Vice City he comes back as a supporting character - and more neurotic than ever - in Liberty City Stories as the Leone family's preferred candidate for mayor.
Affably Evil: He's impeccably polite and professional, even while planning to invoke a gang war to drive down real estate prices.
A dirty cop in Liberty City with connections to the Yakuza and Phil Cassidy. He needs Claude's help in avoiding being arrested for the numerous crimes he's committed both against the people of Liberty City as well as the United States at large.
Cool Car: He owns a bulletproof Patriot, which he eventually gives to you.