Vinz

The Hero Dies: In the final moments of the film.
Informed Judaism: He's wearing a necklace with a Star of David on it, and he's shown dreaming about dancing a traditional Jewish dance.
Jerk with a Heart of Gold: The tough delinquent raised in Paris' roughest neighborhood is ultimately motivated by grief for his fallen friend, and is shown to be rather sensitive and protective of his other two friends.
Manly Tears: Vinz is brought to tears when he's about to kill the skinhead, but realizes he's unable to.
Nice Jewish Boy: Averted. He's the most violent of the trio, even though he is a Nice Guy deep down.
Paper Tiger: Despite his violent fantasies and brash threats, when faced with the opportunity to murder a neo-Nazi skinhead, he's unable to carry out the deed.
Pay Evil unto Evil: Vinz vows that if his friend Abdel succumbs to police-inflicted injuries, he'll kill a police officer, as payback.
You Talkin' to Me?: Vinz reenacts this.

Hubert

Actual Pacifist: Hubert is vehemently anti-violence, in contrast to his rage-filled friend prone to violent fantasies.
Neutral No Longer: Throughout the film, Hubert takes a subdued, pacifistic approach to the conflict he's surrounded by. The death of Vinz ultimately spurs him into taking a stand, and a potentially violent one at that (one interpretation of the Ambiguous Ending is that Hubert killed the policeman who killed Vinz, ultimately carrying out the deed he worked so hard to prevent).

Graffiti of the Resistance: Saïd appears to seek resistance through graffiti. In the very first scene, he vandalizes a police car with "baise la police" ("fuck the police"). Later, he changes a billboard which reads "le monde à vous" ("the world is yours") to "le monde à nous" ("the world is ours").
Heroic BSoD: After witnessing the death of his closest friend before his very eyes, the final shot of the film is Saïd's horrified, broken expression.
Plucky Comic Relief: Saïd spends most of the film dutifully following Vinz around, trying to make him laugh.

The Ghost: Abdel never appears onscreen, but it's his injury and later death that spurs Vinz into pursuing revenge.
We Hardly Knew Ye: Abdel is comatose when the story begins, having been brutally beaten by the police. He later dies.