Poseidon would have a BLUE trident with a light blue shirt and dark blue swim trunks. He would have little sprayers hidden in his sleeves that sprays water with the word 'Water!'
Hello Riley, great idea! And maybe a long beard, white and with some algae in it!(the simplest white beard that I've ever seen... tie a thread to both ears, pass it under the chin and hang on it long strips of white toilet paper... at least it's easy to make!)