Aqua Chicken

What's surprising about the Aqua Egg is that, despite being so squishy, it nonetheless takes the shape of a bird following incubation, and even gains the ability to fly. As it grows, the amount of fluid produced within its body increases, which should result in an even greater power boost for any water hero soul it merges with. They're even harder to catch now that they can fly, however. And adventurers love their unique squishiness, too!