Please clear some things up by answering these questions
1. Like Bankai said, did you merge your ijji account with your existing Aeria account already?
2. If you already merged, are any of your previous characters showing up? I'm assuming no since you said you had a character named LigHtRidEr that is now gone. It was common for characters to not show up after merging, as it was addressed in this thread:
You must submit a ticket in order to get this issue resolved. Here is the ticket link: