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Knuckles the Echidna is the Guardian of the Master Emerald who resided in Angel Island. When Metal Sonic stole the Master Emerald from Knuckles, he's on the hunt for gaining the Master Emerald back, and mistook Sonic for Metal Sonic. He is a minor antagonist turned major protagonist in Blue Blur: Curse of Mobius, and is a recurring major protagonist in the entire Blue Blur saga.
His appearance is a bit of a mixture with a lot of different continuities, alongside his own original features. He has the buffed body from Sonic Boom, the tough and low-tempered but dense and easily-maniuplated personality from the games, and the cowboy hat from the Sonic OVA film. Originality-wise, he has fingered boxing gloves with spiked brass knuckles attached to it, rather than the usual big mittens.
Since Knuckles lived on Angel Island his entire life as the Guardian of the Master Emerald, sometimes he can be seen as a tough and powerful warrior, but other times he's seen as childish and very short-tempered. He is very determined on specific missions, especially if it involves the Master Emerald, and whenever the Emerald is safe, he's normally seen as calm and focused. But if one person step in the floating island, he would see him/her as an intruder and go after him/her without a second thought. He's brave, focused, and always on standpoint with every mission.
However, his biggest weakness, arguably, is his intelligence. Not having the best mind for a Guardian means that he can easily be manipulated by anyone, which is what Robotnik took advantage of for killing off Sonic. It doesn't help that he's also very quick to get angered. This, alongside his weak mind, makes him very easily manipulated, and can turn against Sonic in an instant for all the wrong reasons.
- "As far back as I can remember, I've been living here on this floating island. Always guarding the Master Emerald from anything that could harm her. I don't know why I was given this duty, why it was my "fate", but it's who I am now: a guardian, destined to be up here forever..."
- "Isn't that the same hedgehog that stole the Master Emerald? And... Is that a piece of the Emerald that he's holding? Did he broke her?"
- "Shut up, hedgehog! Give me that piece of the Emerald, or else you'll get a taste of my fist!"
- "My hat! You ruin my beautiful hat... You'll pay for this, plant girl!"
- "Hey, get back here!"
- "Hey now, unlike that hedgehog, I don't chuckle at enemies. I'd rather flex my muscles and punch them."
- "So uh, real talk, plant girl. Anything new between you and that fox? Getting along well?"
- "Robot scum!"
- "Heh, I was born ready, Eggman!"
- "Call me the 'Can Opener', because I'm about to bust open your ass!"
- "This whole mess is Sonic's fault. He just likes to beat up Eggman for kicks rather than freedom."