I had a character in an old heaven/hell rp who was angelic as heck and living in, well, heck. His lover was insisting he needed a guardian and protector and while out in the wilds of a demonic kingdom, he stumbled across a gryphon who had been wounded. That gryphon returned again and again out of debt and fealty to him and became his own character the longer he was played.
Flash point 10 years later, that angel is ditched in the wayside by Sei'ku here has been through various character cycles in different verses and styles and is one of the closest characters to my heart