Muses are strange phenomena. A seperate being, usually from a distant universe, with whom one bonds with naturally in order to enhance their creative side. Examples of these beings are "original characters" and other versions of "already created characters" (roleplay blogs on tumblr count as this, even idol roleplay blogs). This "ability" to bond with beings is mostly present in kids, teenagers, and people in their early twenties, though there are older people with this ability as well. It is a very good ability to have, because it gives the person talent in writing and drawing. The bond can also partially break and limit the person's ability to create; but a bond cannot be entirely broken. Only a select few know that they have bonded, however; the reason many older people don't have it is because they do not acknowledge the fact that other beings exist. But... that's all I know on the subject.