Most of these questions are "choose one from the above", the other is "check all that apply". I've tried to cover all the options I can think of - if you want to say more, please continue in comments!
Did you get the livejournal username you wanted?
What does your LJ nickname mean?
Would you be happy for someone to shout your LJ username at you in the street?
If you have a number in your name, what does it mean?
Do you ever wish you could change your LJ username?
Something random I thought of while compiling this poll (and yes, this is the random triviality I promised on Friday) - in American English, the word "check" is used as a verb to mean "make a cross in the box that applies". (In the UK, we usually tick boxes, not cross them - and I don't think "check" is used in this context - except by Brits like me who have been exposed to US culture too much on the internet). Also in American English, the game that we call "draughts" is called "checkers". In this game, you move circular discs around a board with a grid-pattern of boxes. Now, how come when you "check" a box, you put a cross in it, but when you play "checkers" you put a circle in it?
Yes, I said it was trivial.