CHAN×CO (pronounced chan-ko) is an amateur male illustrator. However, he has become very well-known in the Vocaloid world for his very cute and distinctive chibi illustrations. Some random facts about him is that he likes AMANO Tsukiko’s songs, lives in Chiba prefecture, and uses a Wacom Intuos 3 in a Windows XP environment. Also, despite producing such cute stuff, he is indeed male. He is part of ZANEEDS a Vocaloid music group led by composer ZANIO, as their illustrator.
His chibi style speaks for itself as it is actually instantly recognizable, but his regular, serious attempt drawings are also easily distinguishable. They are characterized by very clean lines, relatively vibrant colours, and kind of an anime-style solid shading and lighting, but with a little less contrast between shades to make it seem smoother. He rarely draws backgrounds for his pictures, and usually paints on a single colour canvas. To put it shortly, everything abut his style screams clean and sleek. However, he sometimes wanders out of his normal style and puts out some very quality work, such as this popular picture.
君の知らない物語 (Kimi no Shiranai Monogatari), the Bakemonogatari ED, has its full version leaked. On nicovideo it has received an overwhelming response, giving it the daily #4 ranking of all videos. I guess ryo and nagi are awesome like that.