Avatar Animals

So I got a light blue kayak for my birthday and I want to name it something from Avatar, but not something obvious. Something water related and something only Avatar fans would know. I've narrowed it down to four choices: Platypus Bear, Turtle Duck
Unagi, and Lion Turtle. Which one should I use for the name?

Avatar:The Last Airbender and The Legend of Korra (c) Bryke
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The winner is Unagi!!