if you want a REALISTIC one, look at mermagica or the mertailor there really great if you wanna buy an actual tail.
The only way you can become a mermaid princess is to get a costume at a store and make believe you are one. Mermaids do not exist in real life and people can't turn into one.
A costume shop. Companies that sell patterns like Simplicity or McCall's might have the pattern to make one out of fabric yourself.
Costume shop
Seira is the youngest mermaid princess because as Sara was the orange pearl mermaid princess she went to live with Gaito and therefore they made a new orange pearl mermaid princess called Seira and she is about 10 or 11.
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A: You can't.
There is no such spell to turn you into a mermaid.
Anywhere that has a costume
You can watch how to get a Halloween mermaid look by typing in "Mermaid Halloween Tutorial - Makeup, Hair, and Costume!" on YouTube.
Mermaids aren't real so if you want to be a mermaid you should dress up in a mermaid costume.
The cast of The Princess Mermaid - 2013 includes: Monique Grund Lisa Sargent
There are several websites which provide direction on making a mermaid costume. Coolest Handmade Costumes, Tootisie Grace and Light in the Box are all online websites provide information about sewing mermaid costumes.