Dr. Milo?

I'm probably wrong but Wonder Woman?

Talia al Ghul?

<p>Oh ho! Why it's none other than that sinister, stately spectre, the evil, ethereal elitist, that aggravating, aristocratic apparition, the malevolent, monocled manes, Jim Craddock himself, better known as the ghastly Gentleman Ghost! Mwahahahahaa! </p><p>It was much easier when I read the question correctly. </p>

<p>Arise Etrigan is right! In the series bible, they listed some future episode concepts. One featured Zatanna doing battle with Gentleman Ghost. I've also heard that he was supposed to be in TNBA, voiced by someone along the lines of Sir Patrick Stewart, and he was replaced by Klarion, but I don't know if it's true. </p><p>Any fan should read the series bible. Just look it up with whatever search engine you use. </p>

Which superhuman recieved his powers in the mail by mistake of the sender?

Is it Louis Martin aka Major Bummer?

You got it.

<p>It's actually a very funny story how I know. I actually was pressing the 'random' button and I stumbled upon his page. </p><p>And is it my turn to ask the question? I'm not entirely sure how this works. </p>

<p>Yup, you go next. </p>