Sonic the Hedgehog, Sonic and Friends Wiki
Shadow the Hedgehog - Wikipedia
The Essential Guide to Sonic Characters: Friends and Foes
Sonic Robo Blast 2 - SRB2 Wiki
Knuckles the Echidna - SmashWiki, the Super Smash Bros. wiki
Sonic the Hedgehog (character) - Wikipedia
Sonic & Friends, Sonic Wiki Zone
Lorcan the Hedgehog (Character), Sonic and Friends Wiki
Sonic Prime (Western Animation) - TV Tropes