Yes, Kassidin is a rogue wickerbeast. Allow me to explain:
Due to his pride, Kas has always loathed being seeing ad insignificant and superior compared to the other wickerbeasts due to the birth defect that left him hornless. To hide his condition from others, he applies four horns to the top of his head with an adhesive he acquires every few weeks. I'll provide the hornless version in the full ref, this is just a "trailer"

Wickerbeasts created by
Character and art by (ME!!!!)