You can (and are encouraged to) change your website user account name to reflect your character name, either completely or as Jane “Empress Theodora” Doe or something like that.
If you’re using an email address just for this game, I also recommend putting your character name in the sending field in your email headers: http://www.cnet.com/how-to/change-your-name-in-gmail-yahoo-mail-and-outlook-com/ so its easier for everyone to keep track of. (Also helps if you’re using a pseudonym in general).