The prowl with sidecar/armour is pretty sweet, I don't watch the cartoon so it doesn't really bother me if he is a ninja/samurai or whatever, I just want it cause it looks pretty sweet. TFs with armour FTW *COUGH COUGH* City Commander

But yeah, Gok can correct me if I'm wrong, but I'm pretty sure ninjas are all about stealth, which is why they are always wearing single colour (usually black for camouflage, I guess), light, and mostly silent outfits. Whereas samurai are you soldier kind of deal, whom are fighting one on one with swords mostly, so they would definitely need armour

EDIT: Yeah, along the same lines as what Liege said ^^