NBA Live 2003 cheats and cheat codes for Gamecube

Unlock characters:
Go to the create-a-player screen and enter the following cheat codes
as a name. If the codes are accepted, you should see a message. Choose
the "Sign/Release Player" option to select the unlocked characters into
your team.

B-Rich: Enter "DOLLABILLS"
Busta Rhymes: Enter "FLIPMODE"
DJ Clue: Enter "MIXTAPES"
Ghetto Fabulous: Enter "GHETTOFAB"
Hot Karl: Enter "CALIFORNIA"
Just Blaze: Enter "GOODBEATS"