Knuckles the Echidna is one of the main characters in the anime series Sonic X . He is an anthropomorphic echidna, famous as a treasure hunter and a master of martial arts. Knuckles' primary ability is strength, his arms are so powerful that he can shatter rocks. Ever since the first Chaos Control incident, Knuckles has become dedicated to finding the Chaos Emeralds so he can go back to his job of guarding the Master Emerald as soon as possible which he takes very seriously.