All of them have changed except Eggman's voice actor.
The mystery character in Sonic Rivals is Metal Sonic. To win him, you have to beat the game once with every character. Doesn't matter which order. You can also win Super Sonic. but that is Xtremely hard. U have to get a S grade in every level, and every zone.
The two playable characters are Sonic and Blaze. You get Blaze by beating Zone 1 Leaf Storm with Sonic.
To unlock that difficulty you must beat the game with every character (sonic, shadow, silver.)
beat the game with every character that's the only way trust me. hope this will help you
Every actor who played the character is the closest there will be to him existing in this world.
Generally Sonic excels at every sport other good characters are Bowser and Mii.
oh come on shadow is not popular sonic is sonic is faster and stronger than shadow sonic is the main character shadow ruins sonic shadow had his own game AND IT SUCKED! sonic faster than shadow stronger than him in every way
There are many factors on who should change or not, if they are a main character (knuckles,shadow,sonic,tails) then in order to keep modern, their voices will change more than the minor characters/one time apperance characters (vanilla,metal sonic,mighty).
Presuming you didn't notice, Sonic runs as fast as every other character in the game. For example, Storm runs as fast as Tails, who is as fast as Knuckles, as Jet, Wave, Sonic, Shadow, Amy, on and on and on. The same applies in everything. The only difference a character makes in gameplay is what their basic move is (Sonic=Speed=grinding).
on www.marat's mugen archive there should be a robotnik boss pack and a sonic character pack and on mugen masters there should be a sonic battle pack but no super sonic. www.marat's mugen archive there should be a robotnik boss pack and a sonic pack and on mugen master's there should be every character for sonic battle.
You start off with every character. There are no secret characters to unlock.
If you play through the story mode you unlock every character. And if you play with another friend in a mode you can have a battle with sonic and if you win, you have him (i got him)