There isn't any way to change it currently that I know.
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Unfortunately, you can not change your name on Minecraft!
It means, that your account is hacked. delete your .minecraft folder (backup save files) and change your password on minecraft.net. Redownload minecraft and it´ll work.
You can change your minecraft clothes if you change your skin or download a mod.
Look up the default controls on the minecraft wiki page, go to the control settings in minecraft, and change them.
There is not an End Castle in minecraft, the End is basically only to fight the Ender Dragon. But maybe we will see a Ender Castle in further updates.