Seriously though, the original mythological unicorns were highly aggressive, violent creatures (which makes some amount of sense considering they were inspired by sightings of rhinos). Since we’ve already got griffon and dragon Grimm, I honestly would not be surprised if a unicorn-like Grimm were revealed (though it would probably be called a Monoceros or a Karkadann).
Grimm Diaries at Grimm wikia:
“The horn of the Bath is his primary weapon and is used to impale small children, which it then eats. Much like the tusk of an elephant or horn of a Rhino, it appears to be part of the skull. I highly suspect that the Bath can see in the dark. His movements are primarily nocturnal and deep within the forest where the sun barely reaches, even in the daylight. The nose of the Bath is elongated like that of a horse, with large nostrils and overlapping upper lip.”
I’m now scarred for the rest of half an hour
This is why 90% of Remnant’s population is armed.
*Abath
“The horn of the Bath is his primary weapon and is used to impale small children, which it then eats. Much like the tusk of an elephant or horn of a Rhino, it appears to be part of the skull. I highly suspect that the Bath can see in the dark. His movements are primarily nocturnal and deep within the forest where the sun barely reaches, even in the daylight. The nose of the Bath is elongated like that of a horse, with large nostrils and overlapping upper lip.”