who is grimm
A Grimm (Ger. wrath) is a special person who possesses incredible powers, such as being able to see the true form of Wesen even when the Wesen don't want them to.
The Brothers Grimm, otherwise known as Jacob Grimm and Wilhelm Grimm, were German librarians who also specialized in philology, which is the study of language in historical texts. During the early 19th century, they became interested in cultural research and began to collect and publish local folklore.