First, you've got your Social Justice Warriors. Their job is to draw aggro, so they need heavy tanking armor. The best tanking armor is White Privilege, which means that, honestly, Cis Het White Male is actually a good race for SJW. Thick Skin is necessary, too. You really need visibility to make your Taunts work well, so you need a very public persona to draw aggro well. Chris Kluwe and John Scalzi are two examples of effective Social Justice Warriors.
Social Justice Mages are your primary DPS class. They work with philosophy, law, and public relations, and, as such, they need very high Int to be effective. Their job is to attempt to do the real heavy lifting in trying to shift the ground in the society. I mean, obviously, that's what EVERYBODY is doing -- that's the point -- but they're the main DPS in it. SJMs include people like bell hooks, Lawrence Lessig, Justice Sotomayor, and the EFF. Anita Sarkeesian is the ultimate SJM. If the bad guys are specifically trying to get you, you're probably an SJM-- they try to get Brianna Wu and Zoe Quinn.
That's because they're the highest DPS, which makes them the most important targets, which is why it's actually USEFUL to have SJWs drawing aggro away from them.
Social Justice Rogues are the secondary DPS class, but deal with more offbeat attacks and debuffing opponents. Their weapons include satire and mockery. Rogues, as a class, tend to the chaotic, so you also find SJRs doing things of questionable morality, like trolling. Stephen Colbert is a SJR, of the Neutral Good variety, and I have a vague suspicion that Josh Feuerstein, the guy who started the "Starbucks is anti-Christmas" thing, may be a Chaotic Neutral SJR. He does this whole thing where he makes up stupid outrage stories, and then sees if he can get the media to report on the dumb outrages. By goading right-wing culture warriors into doing incredibly stupid things, he makes the whole side look ridiculous, so I suspect that he's an SJR doing a strike from the shadows. Social Justice Rogues include Social Justice Bards, like Woody Guthrie and Pete Seeger, who focus on buffing their party more than debuffing the enemy.
Social Justice Clerics are about buffing and healing the other classes. Many of them are actual clerics, and provide the religious and moral frameworks for social justice. Their messages are for the other SJ people, not the general public -- their job is to help the other warriors not give up, to know that what they are doing is important, to keep them going, to keep them mentally healthy. Right now, the most prominent SJC in the world is probably Pope Francis -- which just shows that not all SJ folks are on the same side on all issues. He's definitely a SJC, even though he's wrong on gay rights. You don't HAVE to be an actual religious person to be an SJC, but it can help.