Rin Okumura is one of my favorite characters, he is cute and cool, although he looks immature and violent (he is elder brother), actually he is kindhearted and strong-willed, in addition, Blue Exorcist Rin has demon ears, dark blue hair and black demon tail he hides it under his shirt.
As for Ao no Exorcist Yukio Okumura, he is the younger twin but acts maturely and thoughtfully all the time. Yukio wears glasses and has brown hair and three moles on his face. He uses guns as an Exorcist.
There are cute school girls and sexy lady in this anime, and many other characteristic characters. All in all, I love anime Ao no Exocist and have watched it many times now. Cosplay Rin and Yukio would make any cosplayers outstanding.