User blog comment:The Milkman/Mass Effect in Retrospect/@comment-4950455-20130417203249/@comment-2250460-20130419193740

What character arch do you want? Citadel might count as a personal character arch, the romance with squadmates throughout the series is also a big one.

But personally, if it doesn't matter to you whether it's impossible or not, I see no point in arguing it with you.