His reptilian tail, which encircled the Earth, could be a bit of a nuisance when he got excited. His brothers had to tie it down to stop it causing damaging.
He then discovered an ability to take on a white shark aspect, which meant he could thrash merrily around in the sea with only a few tidal waves.
Always one to push the boundaries, he then had a sex change and is now a Goddess. Thereby hangs a tail.