I never thought I'd have to address this problem. However, some have been doing this all too much recently.
If you're going to make an alternate account to be a fake person, you have to tell an administrator and it has to be for serious reasons.
Why can't we have some fun?
False identification on the internet is serious. It shouldn't be something you claim as "fun".
What if I'm caught as another person on a different account?
If it's your first time, then we'll warn you.
If it's NOT your first time, then you will be banned for however long the admin deems necessary.
What if I just don't want to tell you that I'm this person?
It won't change the fact that you'll get banned if you're caught lying about who you are to everyone, especially administrators.
How many alternate accounts can I make for this?
The recommended amount is just one, but if you have to, then two ( maybe three ) is fine. Once again, they have to be solid, good enough reasons to be made.