As I wrote in my previous post, Koji Uenishi performed Ultraseven so that he made the hero look like a samurai warrior while he was from a group of sword action actors under Toshiro Mifune (Uenishi is alleged to have been with Mifune Production back then).
According to the autobiography “A Man Who Became Ultraman”authored by Satoshi (Bin) Furuya, Narita told him that the actor for Ultraseven was brought to Narita as Tsuburaya Productions decided to place more emphasis on action for the upcoming product and he redesigned Ultraseven he was working on assuming Furuya was supposed to play the new hero.
And, when he looked at Ultraseven in the studio for the first time, Furuya also says the appearances made him imagine a bushi (samurai warrior).
When looking at the prototype model (small statue to see what it would look like before making the costume for real) sculpted by Akira Sasaki, it makes us aware the shape of Eye Slugger looks slightly different from the costume actually worked out.
As to the crest-like part including that of Ultraman and Ultraseven’s Eye Slugger, I remember I read somewhere someone says Narita told him that those parts came from the chonmage (traditional topknot hairstyle) worn by samurai warriors when asked where they came from.
Although I am not sure if this is true (partly as Narita seems to have been a cheerful man who was very much fond of joking all the time), I think Ultraseven is certainly a hero who could be associated with the samurai warrior along with his powerful-looking, brisk movements performed by Uenishi.
At any rate Uenishi Seven is one of the unforgettable heroes alongside of Furuya Ultraman.