And I don't know if its fixed yet but on version 0.12 I got the skeleton princess and I equipped her with the shape changing weapon and somehow the effects also worked on Sir Knight so I'm a snake now and I can't change back lol. It changes back after I use the shield but then it reverts after I enter a new area.
*Edit* and I also sold the human princess to the brothel but whenever I try to buy her back my game crashes.