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According to Sonic lore, these are the same character.
The songs "Goin Down!" from Sonic Adventure and "Stimulation" from Capcom vs SNK 2: Mark of the Millennium 2001 share the same rap sample.
Sonic Adventure came out first, if the title for the latter game did not give it away.
Amy Rose seems to be the only character in the main Sonic the Hedgehog cast who can handle a casual punch from Knuckles.
Sonic has two styles of wearing stocking caps, either simply on his head, or by slipping it on his top quill.
Sonic the Hedgehog's Holiday Cheer Suit in Sonic Frontiers is based on an outfit he wore in a Christmas promotional artwork for Sonic Adventure, which has gone on to make several other appearances over the years.
There is no heterosexual explanation for Rouge the Bat and Topaz.
Stealth the Hedgehog is an alternative version of Sonic the Hedgehog in the Zone of Mobius-Seventeen. Stealth's arch nemesis is the evil Professor Egg.
Both Stealth and Professor Egg are parodies of Marvel's Spider-Man and the Green Goblin.
In the Sonic the Hedgehog Archie Comics, Espio hails from a group of ninja chameleons known as the Shinobi Clan.
The choice of name is likely a reference to Sega's Shinobi franchise.
In Archie's Sonic the Hedgehog #188, Bean asks Sonic about marrying Sally and having mutant babies with her.
Their future children are actually quite normal, they are both named Sonia and Manik Acorn respectively.
Yes, it's a Sonic Underground reference.