Actual Pacifist: Hubert is vehemently anti-violence, in contrast to his rage-filled friend prone to violent fantasies.
Angry Black Man: Averted. Hubert, the sole Afro-French character, is quiet, pensive, and mature. It's Vinz, the Jewish character, who harbors the bitterness and anger towards the injustice he and his friends face.
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 its 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.