you can change your password by making a new account but keeping the same name then type your different password!
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you change the date on your ds and it should change on the game :)
You can change your minecraft clothes if you change your skin or download a mod.
You can change your pass... but i don't think that you can change user.....................
You don't change the traits, once they are set on the game, you can't change them, but you can change some other things.
To change your name on flipnote hatena just change your name in the System settings and it should change on flipnote hatena. Or if you want to change your user name I have no idea, If i find out i will tell you thebacman@hotmail.com wwwflipnotefans.webs.com to change your user name you just change your name in your dsi settings.