Warning: Contains SPOILERS for Sonic the Hedgehog 2!
It has already been confirmed that Sonic the Hedgehog 3 will feature Shadow the Hedgehog, but it is likely that some other game characters will be debuting as well. The recently released Sonic the Hedgehog 2 showcases both Tails and Knuckles, who were mostly absent from the original movie. It can be expected that Sonic 3 will be even bigger and better, though, and there is a long list of characters from the series that could appear.
Starting as a game released in 1991, the Sonic series has become a massive hit across several mediums in the three decades since its inception. On top of the over 100 games, Sonic has spawned spinoff TV shows, comic books, toys, and more. Because the series has dipped its toe into about every medium possible, Sonic has understandably added a lot of characters over the years, many of which may appear in Sonic 3.
Related: Sonic 2 Sets Up Knuckles' Upcoming Spinoff Show In 4 Big Ways
While the post-credits scene of the first Sonic movie only features Tails, Knuckles actually ends up playing a major role in Sonic 2 as well. Similar to the first film, the sequel's post-credits teases Shadow the Hedgehog, a major antihero from the series. However, Sonic 2 shows that the movies aren't restraining themselves to only what was teased in the previous film, as Knuckles is a big enough character to have had his own post-credits scene. Because of this, it is very likely that Sonic 3 will debut other game characters besides Shadow, whether they are related to Shadow's story or are just incredibly popular.
While Tails is Sonic the Hedgehog's most well-known friend, Amy Rose is a close second. This pink hedgehog wields a hammer as big as her attitude,
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