Every Hero needs a Villain, and for Iron Tail that villain is none other than Evil Tail. Like the young Hero himself, his goal of conquering the world simply comes from the belief that it's his destiny as a villain. After a thousand years of being sealed away, the former tyrant known as the 'Great Evil' is now ready to continue what he couldn't many years back. However, he will need a Hero to watch him finally achieving his ultimate victory... and that Hero is Iron Tail.
And here comes the villain of the story! Evil Tail doesn't go far in terms of design seeing as he's physically the 'opposite' of Iron Tail himself, but what makes him significant is his rivalry with Iron Tail and how he actually -needs- Iron Tail to be around to identify himself as the villain. The two see each other as enemies simply because of what they see themselves as, but since his debut their rivalry only goes deeper and somewhat complicated. Iron Tail has to live with the fact that he accidentally gave Evil Tail his current body, and Evil Tail himself has to live with the fact that he'll be reminded of Iron Tail every time he looks in a mirror. It's a rivalry that will not end until one of them comes to an end... but does either one of them actually -want- it to end?
... or do they subconsciously find all this fighting against each other because of their opposing beliefs... 'fun'?
Something I changed in his design is his scarf, which I made to look more torn than usual to reflect his more chaotic nature compared to the honest and pure Iron Tail.
Evil Tail belongs to