Oh, there were many fighters on PC. Except BlazBlue, those are some that come to mind:
Street Fighter (I, II, Super, Super Turbo [arcade perfect port], Alpha 1 and 2, IV, Super IV Arcade, X Tekken)
Mortal Kombat (I, II, 3, Trilogy, 4)
Guilty Gear (X, XX Reload, Isuka)
Fatal Fury (I and III)
Battle Arena Toshinden (1 and 2) - The first game and exclusive PC-only character - Earthworm Jim (not kidding).
Virtua Fighter (Remix and II)
King of Fighters (94 and 99)
Samurai Shodown (II and IV)
Last Bronx
X-Men: Children of the Atom (arcade perfect port)
Bio Freaks
Brutal: Paws of Fury
And I know that fighting games don't sell as well on PC as on consoles, but that doesn't change the fact that I really would like to play it on my PC.