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Naruto and Ranma 1/2 are similar in that both are "fighting" series that have lots of comedy as well. Ranma is generally more silly than Naruto, though. And one has to wonder "Would Naruto's sexy no jutsu work on someone like Ranma?"
Ninja, Ninja, Ninja! Recca and Naruto are similar in that they're both "fighting" series about ninjas (to a point). Both have great action, and if you like one, chances are you'll like the other.
Jin-Roh has a similar feel on the surface to Spriggan. Both are slower paced but still good. Jin-Roh is not much like Spriggan once you get into it, but i think many Spriggan fans would enjoy Jin-Roh.
These two shows have plenty in common. They both have great action. They both take from Japanese history (Ruroken much more tho, since in Naruto it's basically just ninjas taken from history). Neither take themselves too seriously. Both have great characters with lots of development. Both are 90+ episodes. And finally,both are just great series.
Akira is a slightly similar movie to Spriggan. Kaneda slightly resembles Yu; both feature a kid gone crazy. Spriggan and Akira have similar concepts and tone.