Echo the Dolphin

Echo is a character that appears in the Sonic the Hedgehog and its spin-off comic series published by Archie Comics. In the Post-Super Genesis Wave timeline, she is a Mobian and a member of Meropis' City Guard.

History
When Echo and the City Guard came to their usual morning visit to the Eusebes Temple during the Shattered World Crisis, they found the Knothole Freedom Fighters–Sonic, Amy, and Roter–trespassing on their sacred grounds. Once it was decided that most of the Freedom Fighters, Coral and Razor would be taken their king and queen, Echo was ordered to stay at the temple to keep an eye on Rotor and Pearly, which she did accordingly. Later the same night, when the shield protecting Meropis disappeared, Echo and the City Guard were forced to fight the invading Dark Gaia Monsters and evacuate the citizens.

Personality
Echo is an obedient and diligent soldier, following and upholding Striker's orders without question.