All of our old characters carried over to the new server. They just start at level 1 and start with a gift in their inventory. It's just a matter of if you remember the old email you used that the characters are tied to and if you still have access to it.
Rhialto is able to move the characters to a new email if you forgot what your old one was but he is going to need sufficient proof that they belong to you. He had actually made a reddit post a couple years ago with instructions on what to submit to him located here: