I am also trans (likely never transitioning, though I desperately wanted to 5 years ago- too many other issues in my life, sadly, so I'm perceived as the "wrong" gender but have found a way to live with it, even though I don't think of myself that way). Between Krem and Dorian, Bioware has made me exceptionally happy. It hits so close to home with the "seeing the wrong person in the mirror" and "living a lie" and "screaming on the inside". I would totally romance Krem given the chance, even if it meant making an Inquisitor female (who I find so very hard to identify with- my default characters are always male; I tried and tried and tried to make a female Warden for Alistair, and a female Hawke just because, and I can't get anywhere with them). I'll probably make a dozen female Inquisitors that I'll never play with because, given the chance, I want to play something that more represents how I see myself. I don't even get what the issue is, except maybe it's such a strong desire to be true to myself that, while the character in the game isn't "me" it is some somewhat idealized version, I suppose.
The very first time I spoke to Krem, it didn't blip my radar, I just assumed he was very young. It was getting back to Haven and having an actual conversation with him that I realized there was something different about him. I went to the Dragon Age Wiki to have a look and confirmed what I was thinking.
Previous characters have only been ambiguously bi. I was disappointed that Anders didn't tell my female Hawke that he fancied men, too, even if it was strongly hinted in that recruitment mission. Zevran was open-minded and came across that he was taught to do anything to get to his mark, and to take advantage of "pleasure" when he could, but he didn't strike me as actually being attracted to men, it was just that he was willing to give it a go, if that makes sense. He did fall for my Warden though, so there's that.
I like how both Krem and Dorian are completely unapologetic about who they are and what they like, respectively. There's no hemming and no hawwing about it, no "well, I took what I could get;" they are who they are and they like what they like, and that's the end of the story. It's not their defining feature, but they don't pretend that it didn't have anything to do with who they became, either.
People whine about how Bioware is pushing an agenda or whatever. I say, they are willing to put their games on the line for what they as a company believe in- and they still came out on top. People accuse Bioware of "pandering" but if Bioware wants to help engender (haha!) social change then by god they have my deepest respect and devotion, because there's not enough people out there speaking out for people like me.
Krem is awesome. I want to go drinking with him and Dorian and have a long night of ecstatic revelry, wake up with a glorious hangover, and do it again the next night.