Sonic:  A young blue hedgehog who is the main character for all this.  He is exrtemely fast and has an attitude.  He (all all the rest of the gang) can use the power of the chaos emeralds and transform to ultimate versions of themselves.
Miles"Tails"Prower:  A little boy fox who has great mechanical skill.  He has two tails and can twist them to make him float up.  He is kind of a wannabe and wishes to be like Sonic.  His nickname is just tails (the name sonic gave him when he found him.)
Knuckles:  A treasure hunter who keeps the master emerald safe.  He hangs out on the float island and keeps the chaos emeralds (until the military took them)  He cna glide around for some reason.  He has sharp claws that allow him to dig and climb up walls  He's an echidna, in case your'e wondering..
Amy Rose:  A crazy girl in absolutely in love with sonic.  She follows him everywhere.  Sonic has to rescue her a few times.  She has a hammer to pound enemies with.  She seems to be left behind a lot.
Big:  This guy only showed up in sonic adventure 1 (okay, hes in 2, but hidden)  He is what his name is, big.  He likes fishing and is kinda wierd. He also like his pet frog called "froggie" (in case you were wondering, hes a cat)
Dr. Eggman:  This guy's kind of crazy (and fat)  He is really called Dr. Robontick.  Sonic and his pals made fun of him and called him eggman and the name stuck.  He wants to take over the world and is supposed to be a great genuis.
Shadow The Hedgehog: He was biogenetically created in a lab.  He is the "ultimate life" form and has the ability to control the chaos emerald and freeze time.  The military captured him and robotnick freed him.  He helps him in return.  His past is shrowded in mystery, 
Rouge: A expert treasure hunter.  She specializes in getting all kinds of jewls.  She sides with robotnick to get more jewls.  She actually is a government agent.
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