No one is a mermaid so there is no secret to keep. People can not change shapes or into mermaids. Mermaids are not real and do not exist in real life.
You are NOT a mermaid. Mermaids are not real and people can not become mermaids. I imagine your parents would be surprised to find out that you think you are a mermaid. There is noting to be secret about since it isn't real. It is all make believe.
She doesn't have a secret.
Yes
The outcast of the little mermaid is that if you fall in love with somebody that you trust you can tell them that you are a MERMAID or you just fall in love and keep it a secret.
well i think no where
chainsaw its head off
No, being a werewolf and being a mermaid are two completely different things.
There is no cheat for being a mermaid (which SUCKS) but there is a mod on The Sims Mods.
You can't actually become a mermaid but you can download mermaid outfits, that is the closest you can get to being one.
Yes
Being fantasy creatures, it depends on what the author has decided and written into the story
There are no "Secret" rooms, but there are special event places (i.e, Mermaid Grotto) and you can lock your own home to friends only.