Still,, Mephiles isn't iconic enough. That's why most of us want Eggman/Robotnik. He's been a villian since 1991, and any of his robots or even a new one specifically for the Subspace Emmisiary could easily be made. Metal Sonic is a close 2nd, and just like with Biolizard: Isn't Mephiles Dead?
EDIT: And Sonic's model in Sonic 06 is just a high-def version of his appearences in the Adventure series.
Mephiles dead or not, it wouldn't matter when it comes to Super Smash Bros. Brawl. I understand Eggman being a villain since 1991 and all, but in the recent games...He turns out to not be the real villain. Mephiles for the Subspace Emmisiary can easily be made as well.
And Sonic's model in Sonic Adventure is completly different from eachother.
In Sonic Adventure, he is very short and kind of roundish.
In Sonic Adventure 2, he's skinnier and more lengthy, with a darker blue.
In Sonic 06, he's 5 foot tall, and he's sky-blueish.