Luna:
Arthas: A gradual form of the "Fallen Paladin" archetype, he started off assuming himself a force of good, but slowly milled into one of our "world's" greatest evils as he began to purge people who might have been "infected" (Undead in this case being "Jim"). Went on a crazy crusade that once had the backing of his people, but as he continues down the path towards evil through desperate action he ends up accepting this fate overtime as his former ideals faded. Ultimately died and had his sword "Frostmourne" (her forum) taken from him.
Turncoat:
Sylvannas: Began as a quirky leader that enabled questionable behaviors behind the scenes that always led to it's own growth (itself more so than The Horde, but all grew from it). Ultimately wants to turn foes and allies "Undead" (troll-friendly) for their own safety and for overall advantages, but this leaves a bad taste in the mouths of the living. She attempted to wield Frostmourne but saw it shattered instead, stole much of Arthas' undead army, and was instrumental in the burning down of her former home.
Meta:
Garrosh: Insists The Horde be ruled by force, that Orcs are to be seen as the higher caste, and will kill or banish any who aren't on board. While not a fan of many other leaders, even those working alongside him, he accepts their presence until he no longer has to. Garrosh eventually goes nuts when he finds a seat of power nested in negative feelings and insanity, but prior to that he was already alienating people around him who themselves weren't fellow Orcs. Dislikes "The Undead" principally, and will step in to squash their numbers when he feels too threatened by it.
Inquirer:
Thrall: In spite of being an orc with many repressed feelings, having come up as a slave orc he otherwise tries to do "what is right" and "what is fair" for the entire group as he can see it, but this can end up with bad choices made through being too naturally pacifistic (he can fight, really well, but he's not into it like normal orcs). While argued to be weaker when compared to the average for their ferocity, it can come out in other ways (in Thrall's case, Elemental Magic, a force that came from being diplomatic with the elements themselves). Overcoming his own racial handicaps is largely what had Thrall respected, but in the end he was too willing to give his leadership away to Garrosh for some peace of mind of his own much to the detriment of others. After Garrosh was in power he was a part of both the world restoration effort and the means of combating any new threat (including Garrosh down the line), and otherwise serves as an ex-leader of sorts with a leaning on Diplomacy and Compromise that offers advice.
Edvard:
Ragnaros: Armed with the catchphrase "BY FIRE BE PURGED", Ragnaros rules over his dominion with an iron-forged fist (more like a mace). All who enter his domain uninvited are in for a fight, and he's otherwise largely disconnected from the more social side of things in favor of fighting his own personal war. He'll disappear and reappear from time to time largely unchanged, unlike the rest of The World of Warcraft itself.
Blanc:
Milhouse Manastorm: Just check his entry.
Spatial:
Ysera: Known as "The Dreamer", she tends to both "The Emerald Dream", a dreamworld of her own creation, and the waking world as a dragon touched by the aspect of nature. She largely treats the two worlds as connected, one and the same, and the other druids in her charge tend to follow a similar path. She's not entirely tethered into reality as we know it, but instead maintaining two consistent understandings of her two realities respectively while being able to pull things from one into the other. She can be corrupted from "Dream" into "Nightmare" however from this connection, and she always seems a little lost to her environment.
I've been wanting to do a "Compare Forum Members To Media" sort of topic, but this just kinda sprung into my head out of nowhere. I'm not even that big of a Warcraft player.
Edit: Fixed a lore error.