Hello,
Recently realms have merged with eachother. However, I cannot see my realm Kilrogg or Saurfang. I cannot pick an avatar for these realms either.
I have fully removed and installed my WoW, but this didn’t resolve the problem. Decided to check Twitter, but there seems to be no message about this.
Have you put the realms in alphabetical order on the log-in screen? The first time you log in after merge, your realms aren’t at the top any more and they don’t have character numbers by them. Put them in alphabetical order and they’ll be there. Open one and hopefully your characters will be there (if not create a new character which will refresh the list).
Next time you open the game your realm will be back up the top again.
Maybe not on twitter, but there are many threads in this forum about the issue and how to solve it.
Yes, I’ve checked everything even decided to look on German and Spanish realm, but my characters are nowhere to be found. Also not here on the website. It’s like they completly vanished. I wanted to resub, but now I know my characters are nowhere to be found I won’t 
I’ve been browsing the forums and only found people who lost characters, but not whole realms. I’ve just decided to uninstall WoW again, and reinstall
EDIT: Apparantly after reinstalling again the realms showed up. So this issue is now solved
You could have just sorted the realms in the realm list then log into the right realm and they will shown up rather than reinstalling. If that doesn’t work you can make a new character and it will refresh the list.