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The rind hand of Anduin Wrynn is a Worgen named Genn Greymane. He is a Human who was cursed to turn into a werewolf.
Sylvanas, the Warchief of the Horde, USED to be a High Elf, but was killed during the events of Warcraft 3 by Arthas and resurrected as a Banshee.
Races are not restrained to your view of what class fits them best. Undead can be Hunters and that one wanted to be a Hunter.