2. Afro samurai is not an Anime so of course there will be no Asian who can pull it off.
3. It is racism when you say you are HALF of this race and that. If westerner want to say only them who can use halloween then it is up to them because it is their culture, anyone must not object it because it just shows they try leeching of and show how they have no pride of their own race.
Anyway, all the western peoples you show in thus picture just look like wannabe Asians, I will show you one of Asian cosplay I uploaded in here that beat them all down, Metis from Persona 3 FES - Anime Online Gallery
I upload it 10 days ago and have got 68 views while a western cosplay picture there who have aged 5 years 6 months and 11 days only get 1334 vews Confront 2004 - Anime Online Gallery