Mermaid TF in the book version of Ready Player One
 

So I finished watching the movie of Ready Player One, I guess you could say there were TFs in the movie, but it was with the use of "video game spells/item/clothes"

But, I had originally listened to the Audio Book, (narrated by Wil Wheaton), the book and the movie are like, 90% totally different.
But in that 10% similar part, Parzival and Art3mis go to the dance planet.
In the book, Art3mis uses a game spell to give herself a mermaid's tail to do some dance moves, there's a bit of detail, but its maybe about a line or two long.
And I didn't really understand the next bit, but it also seemed like another dance move she used was some sort of "jelly" spell, I don't know. Maybe to dance all stretchy like. Ala Mr. Fantastic in the first Fantastic 4 movie (shudder).

Re: Mermaid TF in the book version of Ready Player One
 

Yeah, if you've only seen the movie, I heartily recommend you read/listen to the book.