array of meta values using WP_User_Query

Question

If you just wanted to know if it’s possible, then yes it is possible.

But the problem as I could see it from your edited question, is that you set the compare to = which should instead be IN.

However, you didn’t actually have to set it because when you supply an array of values, the operator will default to IN.

So the correct code would be:

'meta_query' => array(
    array(
        'key'     => 'user_charname',
        'value'   => array('spongebob', 'mickey'),
        'compare' => 'IN' // use IN
    )
)