In short to OP, you like Leliana, we get it. You like her because you know her, you know what the thrill having having a romance with the Bard could be like and you're eager to be proven right or wrong. Here's a tip. Open yourself up to trying something new. Cassandra may not be attractive to you, but she might be to one of your Inquisitors, same with Josephine, Blackwall, Cullen, Solas, Iron Bull, Sera or Dorian. TRY SOMETHING NEW. And don't forget that people look a way for a reason. These characters represent real people, and the proof to that is written on the lines of their faces, the scars, the makeup, even the build. These people look like themselves, and thank goodness for that because that is far better than the alternative where every character description includes 'beautiful' and 'svelte'.
Thank you for understanding. Something I do want to clarify though is that, I don't find the romance characters unattractive, except Sera who looks like a white Lil' Wayne. They just don't appeal to me, it's like when you see someone (in real life) who is attractive, but you don't want to go out with them because they can be a nasty person, or they look dirty or whatever. It's the same thing here. That's not to say I won't romance them, I will most likely try out all off them because, why not; it's there for me to play so I am going to play it.
You always make a character to be like you, whether it is your 1st character or your 101st character and that character would follow your morals, your ideas, and take on your emotions because it's a little you; and for me, that character would choose Leliana, not Dorian, not Iron Bull or Cassandra or Josephine or any off the others because they aren't my type. I mean come on, the one red-head that is prominent within this universe and they decide to take her out of the equation.