Questions about account requesting

I attempted to make an account about a day ago and everything went well but after that when i wanted to try to do it again (just to check) the process was different. the form i filled only wanted a bio with "relevant qualifications" (if i remember correctly) with at least 50 words. but the second time it showed a more elaborate form with some questions which i assume is the actual one i should've filled. My question is that can i fill up the actual form with the same email on the first one now or should i wait for an answer on the email sent to me from the first attempt? Also is it possible to choose a username that uses variations of the Perso-arabic script? is that feature something being considered? if yes would it be possible to change usernames after creating an account?