Designing a Unique Deep Ocean Creature for Another Planet

Create a fantasy aquatic animal that lives in the deep oceans of another planet. This creature should combine elements of both Earth's marine animals and completely alien life forms. Imagine it glowing with bioluminescence, having the ability to change shape and color for camouflage, and having organs that allow it to navigate in extreme conditions of high pressure and total darkness. The description should include its appearance, behavioral characteristics, feeding method, and interaction with the environment.