Paladins are the virtuous defenders of the weak and tireless enemies of the undead. Mixing elements of the warrior and the clerics of the Holy Light, the paladin is a tough melee fighter. The tradition of the Holy Light is unique to a few of the Alliance races and the blood elves of the Horde.
The paladin is a "Warrior of the Holy Light". They uphold all that is good and true in the world and reviles all that is evil and sinister — especially undead and the Burning Legion. They offer succor to the beleaguered and smites his enemies with holy fervor. They are particularly potent against undead, as these creatures threaten the goodly races and the Holy Light burns them terribly. The presence of any evil is reprehensible to the paladin, but he focuses his efforts on destroying undead and demons. These warriors uphold the tenets of the Holy Light and defend the Alliance from the predations of any threat to their peoples. Found in almost every corner of Azeroth fighting the forces of evil and barbarism, these stalwart warriors of faith ceaselessly uphold their vigil against demonic forces from beyond the Dark Portal. Humans, draenei, and Ironforge dwarves are the most likely to become paladins, as these races revere the Holy Light. Blood elves known as Blood Knights bend the powers of the Light to their will, though rumour has it they have recently began to use the Light legitimately. The paladin order, also called the Knights of the Silver Hand, grew out of humanity’s culture, and its greatest heroes and fiercest proponents are humans. Ironforge dwarves possess the toughness needed to withstand the onslaught of the paladins’ many enemies. High elves rarely become paladins, though this has changed somewhat, as their blood elf brothers and sisters expand the Blood Knight order. The Blood Knights are commonly mistaken as the enemy of the Knights of the Silver Hand by outsiders unfamiliar with the ways of the Light, but this is false presumption. Paladins are the embodiment of goodliness and selfless dedication to the protection of their peoples. They help the innocent and punish the wicked. As such, all paladins are of good alignment.
Here is a list of Paladin.