Attack on Titan(Shingeki no Kyojin) - Who is Levi Ackerman's model?

Levi Ackerman was modeled on Rorschach(Watchmen)

Hajime Isayama said I like way of Roschach' s life.  Levi is obsession with cleanliness, but Rorschach is not. He is 30 plus.

Origin of his name is Levi(Jesus Camp - American documentary film)

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