User:Johnny Marvel Jr.

Echo Echo is a small, white alien whose body is a living amplifier. He is actually living sonic waves contained in a suit made of silicon. One of his most noticeable features is a square appendage resembling an MP3 player behind his back with a port on it - decorated with a 10 symbol and what looks like cassette tapes on his lower legs. He has circle-shaped indents on the back of his hands which are green. The inside of his mouth is green with lines that give it the appearance of an amplifier. His voice originally sounded very high-pitched and tinny, but became slightly lower.

In Omniverse, Echo Echo's eyes bulge out and are now more line-like, and he now has an outline and two black stripes on both of his ear plugs, which are more pronounced and cube-shaped. His legs are also a little bit more stubby and now have three 'toes', and the green circles on his hands are now bigger, covering most of his hands. He is also shorter and has a hexagonal shape on his stomach. The tapes on his legs are now gone. His head is more cube-shaped and wider. The outlines of his mouth and eyes are thicker. His wires are also thicker. His voice sounds more robotic now, and it echoes more, as if he is speaking through a portable microphone.

Echo Echo wore the Omnitrix/Ultimatrix symbol on his chest in Alien Force and Ultimate Alien, and wears the Omnitrix symbol on his forehead in Omniverse.