Some fun character designs for Kristoff in this amazing fanfic called The Stag and the Maiden by not-so-secret-nerd on tumblr.
In this AU, Kristoff is a hunter turned into a stag man as punishment for killing the servant (a deer) of a creature called the Horned Lord who watches over the forests.
He has been stuck in this form for 50 years so far, and either has little to no memory of his past.
I COMPLETELY RECOMMEND IT.
I'll be doing quite a few drawings of fanfic au's. Including The Ice Sculptor by feistypaants and Dark as Snow by Bri-ecrit! Keep an eye out!