Nixus the Echidna

Nixus the Echidna is a character who appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. He is an anthropomorphic echidna and allegedly one of the last remaining echidnas on the planet.

Shattered World Crisis
During their quest to find the last remaining Master Emerald shards and Eclipse the Darkling, Knuckles the Echidna and Shadow the Hedgehog discovered Nixus on Westside Island, who also was on a hunt for emerald shards.

Trivia

 * Nixus's appearance is very reminiscent of both the Sonic Boom counterpart of Knuckles and Thrash the Tasmanian Devil, a character who existed in the old timeline of the Sonic the Hedgehog comics.