1. adult one.
he's literally batman
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2. The last
Looks dogshit. and thats exactly he point, considering kishi had no time to redeem his character (probably because shueisha already told him they got the light novels to cover, which could be adapted to anime), this is the only way to do it. making his life miserable on his journey.
wandering, alone, wearing poncho, rinking from bamboo.
3. hebi (white)
always consider that as the most-ninja outfit. oversized shirt, with sword strapped, armor plate on arms.