Pook is a young Flip-Flopian that lives in Flipside. Pook is a known lover of the sea and wants to be a sailor when he grows up. Pook was the owner of his pet goldfish, Captain Gills. Pook used to keep Captain Gills in a small cup but had to move him into a bowl when the fish got bigger. Merlon was the one who gave Pook the Goldfish Bowl to put Captain Gills in. During Chapter 4, Mario and the heroes needed a helmet to go into Outer Space and Merlon mentioned giving something like that to Pook. Fortunately, Pook was more than willing to give up his Goldfish Bowl but only after Mario and the others released Captain Gills in the water in the basement floor.