To create an anonymous persona, you don't need much. Here's the list:
- An email address (optional): I suggest z.org, pissmail.com, or cock.li;
- A small webpage: rentry.co, fluffle.cc, or repris.org should do the trick;
- A means of contact, such as email or XMPP, has to be something simple.
On the page, you can add any information you want, a cool avatar image, and your contact details. Now just be out there, put your web page in your bio/description wherever you are, and you're done.
Tips/ideas: put the link on your profile on any forums you participate in; put it on a sign inside your land on a Minecraft server; something like that...