FUNimation.com writes: "According to an article posted on Sendai City’s official site, Darth Vader’s design and helmet in particular may have been directly influenced by the garb of Date Masamune.
Though I’m sure the Sengoku Basara version of Date Masamune isn’t quite what old Anakin’s outfit is based on, it’s cool nonetheless. I’m sure if the Basara version became a Sith Lord, he would kick some major Jedi butt. Even Luke Skywalker wouldn’t stand a chance against this Basara Badass.
So, if Masamune is Darth Vader, what does that make the rest of the Sengoku Basara warriors?"