Oh! I love genetics!
Loki here is registered as a 'Sorrel Roan and White/Sabino' which is... incorrect! He's actually a true SABINO Roan, meaning he's not a TRUE roan.
In the winter he's solid brown, with his white markings. No 'roan' in sight
Sire, he has the strangest band going around all of his markings:
Dam is a minimally marked Bay Sabino. She has a blaze, milk chin, and ragged socks. Some very minimal 'roaning' in her coat.
He also has a minimal Black Tobiano sister, and a Black Roan Sabino brother. He was a real cuddle bug as well.
I have better pics here somewhere, I just don't have the time to upload them at the moment!
Loki doesn't have very fancy papers. His Great-Great Grandfathers on the sires side are Zane Grey and Missouri Traveler E. On the dam's side, the only one I recognize his Red Rawhide. No idea what his Grandparents looked like, I can't seem to find anything on them.