Sorry, no account deletion is possible as you can read here (including hints to anonimise your account): http://support.ourworld.com/ics/support/KBAnswer.asp?questionID=796URLS:…
This goes for the My.Opera section. Use the deletion URL (be logged in first).URLS: http://my.opera.comhttp://my.opera.com/community/contact/myopera/?selected=delete