Kappas are Japanese water demons who sometimes eat people, sometimes help them. Their skulls have an interesting shape: a bowl at the top is full of water that gives them strength. Kappas can be malevolent and spiteful but they are always very polite. And that’s useful: in case the one you meet isn’t a nice helpful kappa, bow deeply. It will bow too and spill the water in its skull bowl, spilling its energy and strength.
This is Makiruku. He turned up in the Bristol channel one day.