Board Thread:Suggestions forum/@comment-2001:56A:748F:C100:EC86:4C64:CC7B:4E86-20180911210628/@comment-28153737-20180912065419

HorseLordOfRohan wrote: I'm pretty sure it's a Japanese (that's just an estimated guess, I'm probably wrong), about a water horse, and it looks friendly, but once you get on, it tries to kill you. It's hair is also seaweed. Can't remember where I heard that, though.

HorseLordOfRohan Lord_Of_Horses (Message Me!) Scottish actually. And pretty much, once a person is on their back they become stuck (by magic or something) and then the Kelpie dives into the water to drown and eat them.