I’m so sorry you’re feeling like mobile support has been completely left out. I can understand how that experience could get frustrating and will definitely note it down on our list of pain points.
As for your username, it seems to have gone back to the original mysterious_stranger universally across the forums, but I’ll definitely note the issue of having to change your username before a pfp change can take place 
I appreciate you coming over and letting us know how you’re feeling. It’s important everyone shares their thoughts and suggestions about this platform so we can make it better continually. If you ever have any more suggestions, you can leave them here → DCUI: What Do You Like About DC Universe Infinite? And What Would You Change?