User blog comment:Rassilon of Old/Season two character designs revealed/@comment-174.27.167.101-20120425234332/@comment-4754370-20120426000549

The creators. They can design characters the way how they want to. It's a tail. You'll get over it. For me, I think it adds a wonderful element towards his characterization. Besides his name is Beast Boy, I'm pretty sure that he didn't get that name for no reason, anon.