Ah, that's not how "or" works. Normally WQL will return anything that matches *all* of the queries within it. "or" instead returns anything that matches even one of the queries within it. Unfortunately, since we're using JSON you can't have more than one "type" query in a set of {}s, which is why we created "in" - so that you can do this:

{"type": ["in", "Episode", "Major Character", "Minor Character", "Basic"],

"return": "count"

}

You will only ever need one "return"