Use it as a resource to add flavor to mages in your GURPS game, or add your own styles for others to use. Hardpoint Mostly, it's the careers from Warhammer Fantasy converted to GURPS rules, but there is also a magic system that is more suitable for the Warhammer world.
http://tvtropes.org/pmwiki/pmwiki.php/Characters/Warhammer
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Like its offshoot Warhammer 40000, Warhammer Fantasy Battles contains many playable factions and a large number of named characters.
For the tropes that apply to these characters during the end times, see here.
The playable factions are:
Humans are a relatively young race in the Warhammer world. They do not remember the departure of the Old Ones or the first coming of Chaos, nor do they have the depth of knowledge and wisdom of the Elder Races. However, they have grown to be a dominant species in the world, dwarfing the Elder Races by their numbers if not their sophistication. Unlike other races, Humans are a diverse species, having as many corrupted and cowardly individuals as they have brave and wise heroes. For better or worse, they have taken a central role in balancing the fate of the world.There are dozens of human nations, but only the Empire and Bretonnia are playable. Humans do tend to dominate the Dogs of War list, however.