For the first alternate, we went with the obvious choice for a true ninja: black. So many ninjas from all over movies, comics, games, and TV rock the all-black costume that Strider had to at least give it a try. Strider's trademark scarf sets him apart, but otherwise, this is a very classic style for his profession. This specifically looks a bit like a Hand ninja style, or perhaps the black Daredevil look from Marvel.