She's some MMD char I found on mmd booru named Random Chara [1] (Yeah, no name.)
I'm going to credit luterz, the person who uploaded the model there, because I don't know who actually made it, nor do I have the means to find out.
keywords: short hair, black hair, twintails, black eyes, grey eyes, pink hooded jacket, animal hoodie, hood up, blue camisole, blue denim shorts for her default look