Athlias

Instantly recognized who's hat that was the moment I saw your avatar

http://www.facepunch.com/members/361215-WaffleCopter never replied. But it looks like his avatar isn't based off anything. I found the full version online using iqdb.org, tineye, and saucenao.

http://yusa.imouto.org/image/3f1faf6...sui%20tail.jpg

Provided you still care.