They act entirely like they do in the show, humor, reactions, and all. However, I can see how if someone didn't like the show, it makes the story pretty unbearable. "BUT THE CHARACTERS WON'T SHUT UP!" ... Boi. Have you even seen Sonic Heroes? "BUT UR JUST A STUPID FANGIRL WHO WASTED 1/2 AN HOUR AND 7 POSTS TO DEFEND THIS PIECE OF TRASH!" Maybe so, maybe so...