He is a white humanoid alien who has green slitted eyes, has ear plugs, a backpack with the number 10 on it, tapes on his legs, a big mouth and wears the prototype Omnitrix/Ultimatrix on his chest.
In Omniverse, his head is square-shaped. He is shorter, has stubby toes and no tapes, smaller eyes, the green circles on his hands are bigger and wears the Omnitrix symbol on his head.
Echo Echo can scream at audible to ultrasonic frequencies capable of overloading machinery and stopping projectiles in mid-flight.
Echo Echo has the ability to duplicate himself, not unlike Ditto, but different in that the clones aren't linked in any way, allowing entire groups to be knocked out without harming the rest and he can clone himself much faster than Ditto can.
By combining these two aspects, Echo Echo can create a "Wall of Sound", where Echo Echos can redirect projectiles back to their source by bouncing them off of strategically placed Echo Echos.
Echo Echo can create an "Echo Chamber", where Echo Echos attack from all directions and keep screaming until the target is knocked out or defeated.
Echo Echo can also use echolocation, as seen in Alone Together.
Echo Echo can channel vibrations to enhance his screams, as seen in Undercover.
Echo Echo can transmit sound waves through speakers (such as phones), as seen in Grounded.
Echo Echo can detect vibrations in the ground.
It has been shown that Echo Echo has the ability to use his sonic blasts to create a force field.
Echo Echoes have to go back into one Echo Echo before transforming or else the clones become multiple personalities as seen in Duped.
Echo Echo is quite agile, shown from his ability to jump quite high.
Echo Echo seems to have more strength than his size suggests, as he can kick off the trunk door from Ben's car with one foot.
Echo Echo is able to throw (about a meter) a Plumber Ship with nine Echo Echos in Prisoner Number 775 is Missing.
Echo Echo has a fragile body which can be destroyed easily in battle, as shown when Ultimate Kevin destroyed several Echo Echos with Jetray's neuroshock blasts.
Echo Echo OmnivursEdit
He has his UAF appearance, lives in Omnivurs and wears the OS Omnitrix on his left arm.