My dear [name],
I hope you don't mind all these strange letters, but I just want to share my life with you. Even if you have chosen to live with animals, which I'll never understand.
Don't they smell? Mom
— Mom's letter, Animal Crossing (2001)
Archibald: So what kind of animal are you?
Tony Hale: I should probably go...
Interviewer: "Sonic initially had critters and robots but Sonic Adventure have introduced humans suddenly. Why have you decided to add them?"
Naka: "Action in Sonic's universe unfolded on Christmas Island from the very beginning. Accidentally, things have happened the way there were only animals and robots in there, and and later when Sonic made it to the usual megapolis in Adventure, that's where he met humans."
Interviewer: "But is this island located on Earth or is it some sort of another planet, anyway?"
Naka: "On Earth."
—Yuji Naka on Sonic the Hedgehog, GameLand Magazine (2011)
