The Sailor Stars in the Sailor Moon manga are not transgender. The manga portrays their genders consistently without any indication of them being transgender.
Sure, the Sailor Moon manga is finished. It wrapped up nicely, giving closure to all the characters and their adventures. But you can still enjoy re-reading it or exploring related merchandise and media.
Well, there are a few options. You could look on official manga subscription services such as Comixology or Viz. Or, search for it on popular bookstores' online platforms like Amazon. Sometimes, fan-run websites might have it too, but be cautious as their legality can be questionable.
You can try looking on popular manga reading platforms like Comixology or Manga Plus. They often have a wide range of manga available, including Sailor Moon.
The number of Sailor Moon manga varies. There are the main series, along with special editions and adaptations. But as of now, I'd say there are at least a dozen or so.