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Dunno about trying to imitate dialects but -
I'm a gamer that has played western games the most. I assume that means American English. All those youth years of mine delving in and jumping from a game to another, listening at cutscenes (with subtitles on of course) and talking to other gamers once in a while has probably the most influenced my skill of english.
I think I talk American English pretty fluently nowadays, although I don't speak English daily. Folks have said I'm pretty good at pronouncing.