I can't speak for a blind person, but I would imagine they would be curious and ask about your physical details. It's a bit different when you can't see any details.

There are some major details I would need to know before I would get close enough to someone to sleep with them. I'd expect that person to be open enough at that point to have told me those things willingly. Sure, you can't predict everything that might be a deal breaker, but you can use common sense. Common sense tells me that a person has a high chance of being something between uncomfortable and horrified if they found out they just had sex with someone who is trans. Even if they are only surprised and not upset about the idea of it, what other secrets are hidden? Use common sense to disclose what your soulmate should know before sex and things will likely be okay. You can't please everyone, but it would be boring if we were all the same.

Personally, race/ethnicity is not an issue to me, perhaps it would be to someone else. We all are attracted to different attributes and possessing some attributes can be a deal breaker. Just because someone enjoys certain looks doesn't mean they are discriminating.

If I were blind, I wouldn't care about looks at all, but maybe I'd enjoy the feeling of a slender woman or enjoy the sound of a sweet voice. Your mileage may vary.