How about the striking similarities between the Sith and Blackguard? For instance, both of them have vowels in their names!!! They are both bad guys, and they use weapons!!! I think we're on to something here (or on something here)...
Don't forget the striking resemblance between Yoda and a potted fern. Both are small, green, have pointy parts, and both of them thrive in a swampy environment.