Sonic and MSB Crossover 1

After I did the Sonic / Tenchi crossover pics (There was a 6th, but it never got completed: Sally and Washu), I did a series of Sonic / Magic School Bus crossover pics. As is obvious from the pic itself, this is old (early 1999). Here we have Bunnie and Ralphy! Every one of the pics has a little something where the two characters have something in common. Feel free to take guesses what the similarities are!