I agree with Dominus. Uzu, you are splitting hairs (no pun intended) with a lot of these points, especially the hair (no pun intended again). I mean, I went to Japan for a semester and saw hardly anyone with Dino's hairstyle (and I saw a lot of hip Japanese people). Tameem's hair does have an obvious resemblance to Dino's style, and the pic you posted is less like Dino's and certainly not indicative of any significant trend in Japan.
Also, with this shape shifting weapon, either they will have to have the different forms accessible within different combos, which defeats the purpose of having a shapeshifting weapon, or the forms will have to be mapped to separate weapon slots, which only functions as a way to remove the need to find weapons in the game. That was one of my gripes with Nero as well, the monotony and lack of actual depth.
And as for the smoking, it is very stereotypical and totally against the essence of Dante's character. It may have been the staple of the youth in revolt back when smoking was actually rebellious, but I don't think anyone associates smoking with rebellion anymore. In the context of the game, who would he be rebelling against? The department of health? It serves no purpose in the game except in a last-ditch effort to make him look cool and portray a prisoner of his own vices, from which he will presumably liberate himself by the end.