To use these codes, type them in then press Enter:
COLE            Invincibility and all weapons
RAYL            Invincibility
INVINCIBLE      Invincibility
LUKASZUK        All weapons
TREVOR          Full ammo
SNELLINGS       Full health

These codes change the color of your character:
VINCENT         Gray
BLUE            Blue
SAGE            Green
AVACADO         Light Green
OCHRE           Brown
HAHN            Brown