A few User Field questions

Solved:[size=12]First, and probably the most important, I can't seem to find where, for the "Edit Profile" page, editing of the username exists. I would like to disable the ability to change it for all except the Super Administrator, or even completely remove it, as I can simply directly edit the database to change it. Whether this is done by making the input field hidden, removing the input field, or replacing the input textbox with text of the users name.[/size]

Second, is it possible to have more than one field in a "User Field" file set?
For example, my current project is a site for a game, I would like to include: Character name, Level, Class, and Guild, all in one user field, but looking at the current system, I'm not sure if it is possible to just simply add more database entries into the *_include_var.php
EDIT: I know there is the option to use the Serialize function, but I'd rather not do that, for complications when adding more than one character.

Solved: [size=12]Lastly, and this isn't exactly a user field question, but it's relating to a user field, I am trying to make the User's Avatar photo appear on the User Panel, and if they do not have an Avatar set, for a no avatar image to appear. This is the code I have so far. It does not display the avatar image, but will instead always display the no-avatar image.[/size]

2/3 Problems now solved. Thanks to all that helped so far.

Any help is much appreciated. I am really only beginning with PHP coding, and my current ability is only altering what already exists, rather than creating new code.