Knuckles the Echidna

Knuckles is one main character of Sonic. He is also the guardian of the Master Emerald.

Blackpool
Knuckles first appears again serving as an ally against Kenway, Anarky, Their groups, The Individual Villains and the true villains of the story.

Knuckles The Echidna appears talking about Blackpool of his own game but daveg502 said this adventure is about Black Star, Tsubaki, and Taki. Later Knuckles meets a God of War villain known as Morpheus. Who stole the Master Emerald. Causing The Angel Island to fall.

The B Team fights Sa'luk and Galacta Knight, not only them but with the help of Knuckles the Echidna, who later defeats the two members and joins the B Team.

Friends: Sonic, Tails, Amy, Cream, Team Chaotic, Big The Cat, Connor, Bender, Skipper, Heloise, Phineas, Isabella, Suede, Jack Bauer, Twilight Sparkle, Makoto, Sora, Suki, Gohan, Jesu Otaku, Sarah, Kirrahe

Enemies: Dr. Eggman, Mephilles the Dark, Metal Sonic, Haythem Kenway, Anarky, Morpheus (God of War), Rodrigo Borgia

LOTM: Next Gen Island Tour
Knuckles and Sarah were caught by the villains led by Loki and Wesker to use to find and bring in monsters for the alliance as these monsters know where purgatory is. Knuckles and Sarah were saved by Bender and co and as a result they help in subduing Sari. Knuckles in the deeper parts of the pyramids see something lines of a different language detailing to past events which gets them in trouble with their enemy before they go after Dukat. Knuckles checks in the hopsital with the others regarding Belle while figuring out their next move together. Jack interoogrates Buford and nearly kills him if it wasn't Bender, Skipper, Suede, Jesse, Connor and him stopping this. Knuckles arrives in the Friendship Kngdom and helps the crew with their mssions before they all join up with the rest of the heroes and  destroys the Internment camp, burning it to the ground with "Another Brick in the Wall" while killing any army remaining. Knuckles arrives in Springfield and teams with Bender, Skipper, Stardash, Sarah, Suede, Suki, Connor, Gohan, Sora, Wendy, Jaeris and Bart to defeat the invasion with Garak's help. Knuckles work with Cassie, Sarah and Stardash to fight and kill Willaim Birkin.