The only requirement for returning is to submit a fanfic explaining your IC absence, and the reason for returning to the Tower. Your biography and all fanfics you might have written during your earlier stay have been saved, and you need not resubmit those. If you left us before the implentation of our database, any statistics you might have had need to be resubmitted, through the necessary forms: Talents, Abilities, OP Strengths, Weapon Skills, Benefits. You may also request your Bonds or Promises to be listed , or opt to have your name on the list of people willing to Bond.
Remember, none of your character skills or qualities will be officially recognized IC until they are re-listed!
Please wait for a reply to your application before you begin posting at the Tower. If you don't get a reply within a week of sending your application form, the chances are it didn't go through. So the best thing to do is email the admin team and they'll sort things out for you.