I really don't like the british voices. I feel like high fantasy stuff fits british voices and sci-fi fits american voices. this is more of a sci-fi game. DQ8 is fantasy and fits well with the voices -- plus those are done execptionally well. these, I dunno.
I'll play in english though because I always do that regardless. one thing you'll want to do is turn down the voices as they have a lot of in-battle banter that's not very interesting.
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xyzzy