But that's more an issue of native language. They're going to call him 'Bright-san' because the show was made first in the Japanese language, just like how if the show was produced in America they'd naturally use 'Mr Bright'. You can't really start using foreign worRAB when you're dealing with a specific language audience. Case in point, there's a character in Gundam 00 called Mr Bushido, which is always said in English and is in general suggested to be something off a pisstake. The name 'Mr Bushido' is used primarily because of how silly it'd sound to the original audience.