Some random trivia about Amy's design (and personality too)
Her redesign on Sonic adventure 1 was inspired by high schooler girls and she is also described as a kogal (basically a teenager girl who either adopts gyaru like fashion or has a gyaru personality)
An animation of Sonic going "no", from the DoCoMo chara-den which were avatars you could use for videophone calls on keitai.
Thanks to @rockmancosmo.bsky.social for getting us the footage from DoCoMo's tool's, which were obtained from a P902i phone.