Knuckles the Echidna
Knuckles, like Tails and Silver the Hedgehog, appears running through the shuttle loop in the background of Green Hill Zone. Just like many other characters in the Sonic series, Knuckles appears as a Sticker that Sonic can use and a Trophy in the game.
A powerful red echidna also known by his full name, Knuckles the Echidna. Knuckles resides on Angel Island, where he guards the Master Emerald. Both friend and rival of Sonic, Knuckles is a martial-arts expert who can glide through the air.
Despite this, he still appears as a background element of Green Hill Zone as well.
Knuckles first appeared in Sonic the Hedgehog 3 and is one of the main characters of the Sonic the Hedgehog series. He was tricked by Dr. Eggman into thinking that Sonic was evil and was trying to steal the Master Emerald. Since being tricked, he did all he possibly could to slow Sonic's journey down. Since then he has realized that Sonic was the ally, and they have become friends. Knuckles' most recurring personality flaw is his immense gullibility, having been tricked by Eggman more than once to collect the Chaos Emeralds under a hidden agenda, which sparked numerous fights between him and his ally Sonic, only for the former to realize too late he has been fooled. In recent games, this flaw seems to have disappeared altogether. Knuckles is aptly named for both his spiked gloves and immense physical power in his fist, only rivaled by Sonic's supersonic speed. Knuckles lives on Angel Island, and he is constantly tasked with guarding an ancient and powerful jewel known as the Master Emerald, which is said to be able to control the power of all seven Chaos Emeralds.
In Ultimate, Knuckles has two abilities as an Assist Trophy: digging into the ground like a drill and then upper cutting back up, and using the Homing Attack. Knuckles's ability to dig into surfaces first originated in Sonic Adventure and Sonic Adventure 2; however, in both games he could only dig if he had the Level Up Item Shovel Claw. It was not until Sonic Generations that he could dig without the Shovel Claw. Knuckles's other ability is the Homing Attack, which also made its debut in Sonic Adventure as a move only Sonic could perform. Knuckles was first able to use it in Sonic Heroes.
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