John Belushi as Samurai ~~.
One of my favourite all-time portrayals of a foreigner as a Japanese was the series of Saturday Night Live skits with John Belushi as a Samurai. He was Samurai Tailor, Samurai Delicatessen owner, etc.
Here's John (who's Armenian by the way) as Samurai Deli owner, talking his usual Japanese gibberish with Buck Henry as the customer. I admire his authentic style of returning the sword to his belt and his desire to commit 切腹 or seppuku (ritual suicide or "Happy Dispatch") when the order isn't perfect. (And you get Turkish subtitles!!)
And here he is in Samurai Garb performing with Frank Zappa!