Oh, Vermine Venom!
I've seen her photos before. She's an amazing cosplayer.
Not sure if she can move in that tho xD

I swim in my tails, but I prefer shorter tails in water.

While I "identify" with naga (female would be nagini, I guess), loads of olden mermaid sightings cite how the mermaid/merrow/okeanid was 50-100 metres long.
Which translates as "really long tail" in my book.