i have heard if you want to become a mermaid or merman go to Mako island when the full moon is out it is west or north of the Pacific Ocean If you want to know search
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They can only have mermaid costumes. They don't look that real you can see their feet. If you want your Sim to be a mermaid, buy the Sims 2 of download a mermaid Sim from the Internet.
In the Sims 3 Island Paradise your sims can become a mermaid. In order to become a mermaid, a mermaid must give you the mermaid kelp or in life time rewards you can purchase it. Your sim must be human to become a mermaid (not a vampire, wolf, etc.)
To become a mermaid, your sims need to eat mermadic kelp, which you can get in two ways. 1) Your sim needs to be good friends with a mermaid and then use the 'Ask About Fish Parts' interactions while having your sim underwater with your sim's mermaid friend. If the interaction is successful, the mermaid will give your sim mermadic kelp, which you can then eat. 2) Your sim can also buy the 'Mermadic Kelp' lifetime reward for 25000 lifetime happiness points. After that, mermadic kelp will appear on your sim's inventory.
You must be a lvl 9 Tide-Born. When you do you will get this quest. Press Q and the quest box will show up. The quest will be in yellowish gold. Then once you complete this quest, you go to the assassin trainer or physic trainer and learn the skill to turn into a mermaid. Or merman. :P You must be underwater though to use the skill. Happy questing in PerfectWorld (:
You can't, there is no such thing as a mermaid potion. If you want to become a mermaid on the Sims the only way to do so is by downloading a pre-made mermaid Sim.