Luigi is his hit man code name in the movie. Typically he explains why they call him his code name. In transporter, “why do they call you the transporter?”, because I transport things”.

Apparently he plays a hit a that works as computer programmer during the day, assassin at night. You can only contact him by playing super Mario cart.

When asked why they call him Luigi, “I don’t take any shit, and when you need wetwork , you call a plumber.”