Echo Echo is a small white alien whose body is a living amplifier. One of the most noticeable features is a square appendage behind his back with a port on. Echo Echo is made out of silicon.
In Omniverse, Echo Echo eyes are now line-like and now has two black stripes on both of his ear plugs. His legs are also a little bit more stubby and the green circle on his hand is now bigger, covering most part of his hand. The Omnitrix symbol is now on his forehead. He is also shorter and has a hexagonal shape on his stomach. The tapes on his legs are now gone.
Echo Echo, has the ability to manipulate sound like Benwolf and create clones like Ditto, however unlike Ditto all the Echo Echo clones have the same mind and objective when fighting. He also wears headphones so he is not effected by his own echo's, or other loud noises.