Water is a Soul Demon. Much like Light, Crystal etc. It moves through this relm and many others. In our relm we can easily control it at will if it has chosen us. But in the otherworld... it can persuade us.
Those that have the element Water can control their emotions and expressions, can't be 'read' through their face. Most of the time they don't tend to get tired easily. Creatures of the water are kind but unforgiving. You must be wary.