A hexenbiest. The ones we saw on grimm were not mainstream and I highly doubt they are an indicator of the entire hexenbiest population. As for me, I wouldn't be wasting my time as a lawyer, not with all of the ancestry and knowledge they appear to have. In addition, I'm thinking most of them as so adept at camouflage that if they were to encounter a grimm, which is highly unlikely, the grimm wouldn't even know they ran into a hexenbiest.
The best way to frustrate a cyberbully is to ignore him.