You can't get mermaid powers nor be a mermaid because they are not real. People can not change shapes or turn into mermaids ( think how messy that would be), but it you want to pretend to be a mermaid go to a store and buy a mermaid costume. This is the only way you can be a mermaid.
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.)
There are a number of insurance companies that offer free roadside assistance. Not all companies offer free roadside to everyone, such as RACV which offers free roadside care to 18 year old teenagers and students in year 12.