You're exploring Angel Island when you find the Master Emerald's Shrine. Like any nosy person does, you approach it, and then you hear a soft, yet authoritative shout come from behind you.

"Hold it right there!"

It sounds far too feminine too be Knuckles, so you turn around and see what appears to be a female version of Chaos..? How very peculiar.. She's also wearing only a golden pair of tribal styled coverings, she's quite flat, but she's definitely got something top and bottom.