Fan Casting Knuckles the Echidna in Sonic and Knuckles

Knuckles was only a child when his tribe, and his parents, were extinguished by a mysterious monster involved with the Master Emerald. Tikal's spirit gave him a mission to guard and protect the Master Emerald at all costs. Knuckles was trained by the Echidna spirits in their ways, taught in all lethal forms of combat, and now he is ready to destroy everyone who gets in his way. When Robotnik arrived, Knuckles made it his duty to destroy those who dared to take the Master Emerald. He even told Robotnik that he'd crush their skulls until they become the very soil they're buried in.