Nobody can really agree on what Radormyr looked like, as fond as he was of his own isolation. He never directly contacted humanity.
Most think he was a serpent that lived in the sun and it's not uncommon to hear speak of seeing the tail of a great creature slipping through the thin clouds on a sunny day. Radormyr was always one of the lucky gods, the kind who people thanked for good weather, healthy livestock and a good harvest.
The biggest mystery about Radormyr has always been how his godstone came to be found at the bottom of a dried-out lake.