>>536751634
>The manuals are marketing fluff
NTA, but manual content is directly mentioned in-game, anon. They're obviously meant to be canon.

>>528811856
The Sonic 2 JP manual, which was referenced in Sonic Adventure's story, twice:
>One day, a few days after landing on the island, Sonic noticed that someone was following him. When he turned around, he saw that it was a small fox. When the fox noticed Sonic, it rushed to hide behind a palm tree. However, when Sonic started running, the fox did its best to follow him.
>Well, I guess I'll let him do what he wants." Sonic decided, not really caring.
So Tails is a stalker.