Now, obviously, the Legions come from various planets which have their own dialects and languages and as a result, when speaking Gothic, they would have accents which don't exist in our world.
But lets assume that each Legion has its own particular accent based on current world languages. What would you apply to each Legion.
If I were making a movie about the HH, this is what I would go with.
Night Lords are South African in my mind. There's something about the South African accent that would just work well with a bunch of murderers. Sorry to any South Africans here, I do love the accent (I really do), but it just fits so well with psychopaths.
Just imagine Talos or Sevatar threatening to skin someone with an accent like this...
World Eaters have always been Russian to me.
I'd imagine Imperial Fists to have a very clean British accent.
Ultramarines would fittingly have either an Italian or Greek accent.
Word Bearers, given their arabic appearance would probably have an appropriate accent.
Again, with the Thousand Sons, they'd also have an Arabic accent.
Obviously, White Scars would have an Asian accent, but I think I would go with Mongolian over the other Asian possibilities. It has a far more interesting sound to it.
I haven't really considered Legions such as the Iron Hands, Salamanders...etc.
How do you imagine the Legions sounding?