Sooo...I ASSumed that since Cesar had a horn and the glow, he was a unicorn! I was mistaken! The horn and glow alone, does not a unicorn make...
I should have been clued in from the start when I saw his mood bars were green and not white as a unicorn's should be! Also, he did not have the "unicorn run" effect! The poor guy was missing the unicorn occult hidden trait. I have fixed this and have uploaded a new version, Unicorn Cesar, in the original post!
I have left the non-unicorn version posted as well! :P
His mane, tail and ankles have a brighter glow also!