WWF chamion

Could you clarify which “WWF champion” you mean —
• The WWF/WWE Championship (the top world title)
• A specific era or wrestler (e.g. Hulk Hogan, Bret Hart, Stone Cold)

If you mean the WWE Championship (formerly WWF Championship), the current champion is Cody Rhodes. 

Some notable past WWF champions:
• Bruno Sammartino — held the title for a very long reign. 
• Hulk Hogan — one of the most iconic WWF champions. 

If you tell me the timeframe (1980s, 90s, 2000s) or a name, I can give a more specific answer.