Here are a few comics that fit the bill.
Some of these are a bit more subtle than others, a couple of them I wouldn't have even known had trans characters if I hadn't been following the creators on their social media. (Or I'm just really slow. Lol) They're all awesome comics, though!
I also second checking out @punkarsenic's comic!
I myself work on a comic with some trans characters. My MC is (a heavily closeted) non-binary, and one of my side characters is a transwoman. I will have to put up a warning, my comic is 17+ for nudity, profanity and substance abuse. It also contains sensitive subjects such as mental illness, suicide, abuse and transphobia. So read it at your own discretion.