Hey Pav,
Welcome to our community!
You can find out who your superheroes are if you go to your Member Dashboard in the Control environment ([Analytics] - [Member Dashboard]). In the bottom right corner you can find the list of your ranks. Click on [Superhero] and confirm the selection. The Dashboard will then only show you the users who own this rank (table on the left).
I checked on your community, it should be no problem to have the username PavD actually!? Go to the user overview ([General settings] - [User overview]) and search for your username. If you then open your user profile, you can easiliy change your username their to PavD.
Let me know if you have any issues or further questions!
I follow my nose, it always knows