Knuckles the Echidna's known for his superhuman strength, spiked knuckles, and role as the guardian of the Master Emerald. His personality is often characterized as headstrong, loyal, and a bit gullible, which sometimes puts him at odds with Sonic, though they remain allies. He wears red and yellow shoes with green cuffs, white gloves with spiked knuckles, and white sports tape on his arms and legs. His closest friends are Sonic the Hedgehog and Tails the Fox, with whom he forms a team. He is also close with the Chaotix Crew (Vector the Crocodile, Espio the Chameleon, Mighty the Armadillo, and Charmy Bee), and has friendships with Amy Rose, Big the Cat, and Sticks the Badger. His relationships with other characters vary, ranging from allies like Shadow the Hedgehog to a romantic relationship with Julie-Su the Echidna.