That's Yello, an OC he created. He likes drawing her, a lot. Along with primates in general, but she's basically his favorite. If you want him to stop you could always contact him and go "omg please stop drawing what you love, draw what I love instead" but I don't imagine he would listen, or care. He might even do it more just because he would know that it upsets some people.
Also this thread should maybe have the "Furry" tag since he is a furry artist, as well.