Mermaid is what I was thinking, kinda like in Splash so she could still have legs, (wink, wink) cuddle fish sounds cool too. I think it would be cruel to keep higher brained mammals in captivity, whales are smart, would you like to be confined to your room forever?
Great white sharks don't survive in captivity, they have tried, wouldn't want to be the one feeding them.
I would say a giant ribbon fish, they are rarely seen and are the cause for reports of sea serpents for thousands of years.
:scared: