I'm utilizing a shortcode to output content but I'm not going be encircled by little else, ie, just how can avoid to load the Wordpress theme?
Or perhaps in one other way can one load a custom theme through my wordpress plugin?

I suppose it's easier for you to use custom fields, so inside your single or page file you can examine like "if has X single area, echo just content, else, call wordpress_mind and all sorts of these itemsInch

The easiest way that I've discovered is applying the template_redirect hook:

add_action('template_redirect', 'myoutput');
function myoutput()
{
    if ('my code to decide if output without load a theme')
    {
        include ('/myoutput.php'); // file must be properly html coded
        exit;
    }
}