Sonic Headcanons/AU Stuff 2, because I have many, many more thoughts on the series about an fast indigo erinaceus and his friendos
Sonic got the Tornado in between Sonic 1 and 8-bit Sonic 2, as a gift from Ray, since he decided he wouldn't be using the family biplane since he can natually, or unnaturally, fly. Thus, he gave it to Sonic after hearing Dr. Robotnik was still causing trouble
Until he was 6(or until Adventure), Tails had a very slight rhotacism. The only person Sonic told was Knuckles, who asked why he kept getting called "Knucwes"
Sonic actually ran into "Surge" and "Kitsunami" before Starline got his barbs on them. Kit, actually name Karrent, lived in Marble Zone with his family, meeting the hero when the fennec fox was 7
He met the tenrec later, while adventuring through Westside Island, both Sonic and Tails met Spark the Tenrec along with her uncle and cousins. She was just a dismissive 9yo who thought they were both weirdos, especially Sonic, who she instantly dared to clean up the stables in under an hour
Metal Sonic Kai was originally supposed to have two power sources. The Chaos Rings, and a 3yo Faunan Bee, native to Northeast Isle/"Carnival Island", after removing him from his hive, of course
Said power source was then "stolen" by a 13yo chameleon and an 17yo crocodile, who decided after the ordeal was over to try and raise him themselves, starting the Chaotix Detective Agency! ...Much to the chagrin of Vector's parents, Elwood and Jordan, and Espio's clan in Mimeiratsu[Japan](A direct combination of the word for early dawn(mimei) and lively(ratsu))
Since he hadn't actually been named yet, Vector called the little guy "Charmy", since it was his "charm"(the innate sense most people have for protecting children) that got Espio's attention in the first place
Charmy met Metal Sonic before the original, so he subconsciously feels unsafe around the hedgehog