Many years ago in my AD&D campaign there was a half-orc fighter/thief PC, who was killed while adventuring and reincarnated by a druid as a black bear. He continued adventuring and later got into a fight with another bear, which turned out to have been a werebear. As a result of this he contracted lycanthropy.
But he was already a bear...
So I decided that at the full moon, or in times of great stress, he would transform into a half-orc. He therefore became the campaign's first bearwere, and over time learned to control his transformations and change at will.
