Welcome.. I myself just joined a few days myself. That said, I can say that while this isn't the first forum I ever joined, that honor belongs to Neo Monster Island [the forum for the web comic Twisted Kaiju Theater] , I can say that forums are wonderful places to meet people and make friends, I know from experience.
And while I'm not certain that the mermaid or werewolf spells work, don't stop dreaming. And nothing says you cant mentally become or think like these creatures. To take on there spirit may not be as fun as taking the actual form, it has it's rewards.
"Imagination will often take us to worlds that never were, but without it, we go nowwhere."- Carl Sagan, Cosmos.
Enjoy your time here.