This masked vigilante fought crime along with his faithful servant, Kato. He also inspired a nickname for a form of Chicago transportation.
The answer is the Green Hornet, comic book hero and the nickname for Chicago's old green streetcars. Many people had the right answer, but Margo Sliwa was first. If Margo can send me her address and t-shirt size by e-mail, I can send her the prize. My e-mail is firstname.lastname@example.org.