The only reference I could find similar to Rieka's lycanthropy abilities were from the 2012 Japanese animated film Wolf Children.
Reference photos from the film (NOT MINE FROM GOOGLE IMAGES):
Please Read:
I am also not a native Spanish speaker or of Hispanic, Latino, Colombian, etc.
descent so if I make any cultural or grammatical errors please inform me and I will change it right away. I've occasionally practiced the language along with the customs and traditions for personal interest, but that does not give me the right in any way to claim ownership as it is not mine to claim at all. So if I offend anyone in anyway I apologize and completely understand your pain and will learn to do better. All I want is for you to enjoy a good read, so please do so and be kind to one another. It is also important to know that my character Rieka is also not of Hispanic, Latino, Colombian, etc. descent as well but was raised around the culture with the Familia Madrigal.
~Enjoy, Your Faithful Author~